What is Free Fall?
Вставка
- Опубліковано 11 вер 2024
- What is and isn't "free fall" is a topic of major debate ...mostly because we can't agree on a definition. To my knowledge, every side of the debate is represented in this video.
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Twitter: @nicklucid / nicklucid
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COOL LINKS & SOURCES
Tom Petty - Free Fallin' (at Amazon):
www.amazon.com/...
I was skydiver for more then ten years (500+ jumps) but i finished it, because i got a little bored. Punching every single jump a hole in the air was not my dream of flying. Now i'm a pilot and i drop my skydive pals.
I had so many jumps but i was only on a few jumps weightless, and theese jumps were from hot air ballons. From the ballon you start without any speed and in this case the air friction starts at zero, but increases very fast. The wind sound in the ears during accelartion is amazing. (In this moment you realice why it is so dangerous to fall from the roof of an building!) If you jump out of an plane in the moment when you leaving the plane you lie on an pillow of air because you are moving with an speed of maybe 70 knots or 120 Km/h and the air friction at this speed isn't zero.
What Nic said about the free fall that it works up and down, yeah, this i can now feel too, because i do some glider aerobatics too (really fun and a great challenge) and when I fly the "Turn", a figure in which I fly vertically upwards, I decelarate to zero speed and then I fall back to earth and accelerate, and during that time I feel weightless.
What helps in this case, a glider is build to have a low air friction and in this case the impairment caused by air friction is very low.
I hope I am understandable, because english isn't my mothertongue.
Have fun, and untill next time, remember, it is ok to be a little lunatic...
thanks for including metric
That should be a given
I thought the same thing
I did a solo static line parachute jump back in the 1990s. It was amazing! The scariest part by far was sitting in the plane climbing to altitude: when I jumped I had no fear at all for some reason. I found that it was hard to concentrate on what the brief period of free fall actually felt like because I was too overwhelmed by the sensory novelty of the experience, but it was still cool. By the way, I came in for a perfect landing, and then seconds later, I tripped over a rock and fell on my face! True story.
I've heard that people pass out from the "sensory overload" the first time they skydive.
I can believe that. It was intense!
don't get "falling up" but other than that I enjoyed your video.
Comment added 2 years ago by whatever.
When you throw a ball straight up without hitting anything it's in free fall. Ignoring air resistance and bunch of other irrelevant forces gravity is only force acting on it.
Imagine it like this: you have a wee astronaut in the ball. The moment you release the ball, the ball and the astronaut move at the same rate, so the astronaut does not notice his weight.
This is how zero-g planes work.
ua-cam.com/video/q1_AJWZajEk/v-deo.html&t=3m28s
This weekend has been an epic long study session locked in my room and watching this video just made my day....and its sunday...so its about time
Devin-Mae Rooney You're welcome :-) Glad you liked it.
Your second jump is the most exciting (i.e. scariest) because you're still not used to it, but now you know exactly what's coming!
Hang on, so friction from air resistance isn't a force?
EDIT: Someday, I'm going to finish watching a video before commenting first.
(on your EDIT): It's a hard less to learn.
I personally consider proyectile motion as a type of freefall. There's no real reason to separate the two, because a frame of reference that follows the X-position of the proyectile is also an inertial frame.
Wow I loved it It was excellent video of free fall now I love physics also with bio and chemistry
always something new to learn here...
I truly love your videos!! Each one makes me a little bit crazier!!
Thanks for making them so awesome and funny!
I would never skydive, it's really scary. I don't fell very confortable with anything that transports me: cars, planes, not even bicycles. I cannot even imagine how terrible it can be to depend on a parachute. I prefer keeping my feet on the ground.
Yes, I've gone skydiving and it was intense and awesome! I found this video because I was researching the term "free fall." I'm submitting a proposal to Ignite San Diego (an event where speakers talk for 5 minutes) and my topic is skydiving. :-)
+TheJannybug
Good luck!
thanks sir to make gravity and free fall interesting and easy
i love your question of the day! do more!
I've never went diving, but at terminal velocity is'nt the air applying a 1g force up? It would feel something like super memory foam....
*Does the moon have any effect onto the free fall of an object between the moon and the earth, or the free fall of an object from the left side of the earth while the moon is on the right side of the earth?* I watched some videos explaining free fall on earth without the gravity of the moon which has effects on the oceans to cause low and high tides on earth.
The Moon's gravitational effect on Earth objects is usually negligible (so small we can ignore it). It only affects the tides because its helped by the immense fluid pressure in the ocean. ua-cam.com/video/pwChk4S99i4/v-deo.html
Bungee jump. I was congratulated on my scream. I didn’t reveal that it was involuntary.
If I fall, what happened,I go down or earth comes up to touch me.kindly clear the concept.
Since you feel zero gravity while skydiving, Albert Einstein thought that gravity doesn't exist and things fall toward massive objects because of curved spacetime.
awesome video
Gravity isn't actually a force and motion like up or down is all relative. Doesn't sound like a very good definition.
-Probably Science Asylum in 2019
Hey Nick, I had a question. If you would answer this, I will be very grateful.The question is:
An object is in free fall when the force acting on it is exclusively gravitational. But why then the moon is in free fall? Isn't there centrifugal force acting on it?
Thanks.
Lots of love.
1. Centrifugal (outward) force isn't a real force. It's an illusionary or "fictitious" force that only exists in rotating frames of reference. Centripetal force (inward) is the real force.
2. The Moon definitely has a _centripetal_ force on it, but centripetal force is never a stand-alone force. It's a force _behavior._ It's a description we give to forces. In the Moon's case, the centripetal force is gravity.
@@ScienceAsylum Thankyou very much Nick for the help. I'm a big fan of yours and science, ofcourse. From a "little crazy about science" to another!
Thanks again!
Why is acceleration due to gravity constant irrespective of mass of an object if gravitational force depends upon mass
More mass means more gravitational force... but more mass also means more resistance to changes (inertia). Those two effects cancel out giving us a constant acceleration.
There's no such thing as gravity. There is such a thing as buoyancy and density. Think on that deeply get out of the bullshit they taught you about pseudoscience gravity. Glory be to God almighty, the enemy of pseudoscience and of the devil.
Bob Smithers shut the fuck up and go somewhere
Thank you so much! It helped me a lot
Well these videos were fun. But I just saw it to understand free fall which I understood better in your recent video
Man, there is so much more to tell about free fall in scientific terms. Like Einstein who claimed that free fall was standing still.
Nice way to learn... with having smile on face...
1:02 - Wait, but the (much later) Faking Gravity video shows the Asylum's in space! When did that happen?
+TJF588 This video was posted about two years ago... so plenty of time since then to move to space. The Earth had too many distractions.
Seems Milton sold ya on the prospect.
Late to the party, but I CAN'T BELIEVE YOU WOULD DESTROY A PERFECTLY GOOD JETTA LIKE THAT!
I know I'm kinda late but I'm still gonna ask a question. Can an object reach the speed of light at free fall? (Given that the object keeps free falling forever).
+Moses Thevaraj
Nothing with mass can reach the speed of light by any means (including freely falling). It could REALLY CLOSE though if it had long enough to fall and no air to get in the way.
***** Thank you for clarifying it for me Nick! May I ask where did you get that clock of yours? Its really nice.
*****
It was a gift from my brother, so I'm not sure what store it came from.
But why the different mass stuffs falling at the same speed? Shouldn’t the massive object falling faster?
The more massive thing has more _force_ of gravity on it, but that appears to have no effect on the _acceleration._
The Science Asylum But why did the speeds appear the same?
@@protestant6258 In free fall, all masses will fall at the same rate of acceleration (from the same height) due to the equivalence between gravitational mass and inertial mass.
To put into layman's terms, I'm sure you can use nothing but common sense to reason that it would take more force to accelerate a bowling ball at the same rate as a baseball, right? That's because the bowling ball has more inertia - since it is more massive. This is inertial mass - the amount of force it takes to change the velocity of an object. Mass determines the force of gravity as well. How "heavy" an object is depends on its mass as well, and we call this gravitational mass. These two quantities are the same. In other words, while the force due to gravitational mass is greater on more massive objects (a bowling ball clearly weighs more than a baseball),and since it requires more force to accelerate that bowling ball at the same rate as a baseball, these two cancel out. It's important to differentiate between force and acceleration. An object twice as massive has twice the gravitational force acting on it, but also requires twice the force to accelerate it at the same rate as something half as massive. They always cancel, so things always accelerate at the same rate due to gravity.
Willoughby Krenzteinburg Can you tell me what is inertia exactly? Becoz from micro scale it doesn’t exist, I want to know what is it at particle scale, thnks, bless you
@@protestant6258 Inertia is the tendency of mass to remain in its current state of motion. An object in motion will remain in that state of motion forever until or unless some force acts on it. The more mass something has, the more inertia it has. In other words, the harder it is to accelerate it - the more force it takes.
If you get hit in the chest with a baseball that is going 30 mph, it might bruise you, but it will just bounce off. If you get hit by a car that is going 30 mph, it will likely kill you because the car has a LOT more inertia. It wants to maintain its state of motion and your body which has much less mass than the car does very little to stop the car.
Inertia is also the reason you feel pushed to the right side of a car that is turning left. The car accelerates toward the left, but your body wants to continue in its state of motion - which is straight. So inertia is the tendency of any mass to maintain its state of motion, and the more massive an object is, the harder it is to change that state of motion.
So, an object twice as massive is twice as hard to accelerate - which is perfect because an object twice as massive also has twice the force of gravity on it. This is why the two objects accelerate at the same rate.
but free fall should be described as when an object is at rest going straight through spacetime
Watch to see feathers and a bowling ball fall at the exactly same velocity for about ten meters.
ua-cam.com/video/E43-CfukEgs/v-deo.html
You said free fall is the case where only gravitational force is acting on it.... But when an object falls frictional force(air resistence) is also acting so falling of ball fron a building cannot be the free fall
Correct.
Can you do a vid on the phenomenon of moving things are younger
It's already on the to-do list :-)
NO, SIR, I WILL NOT BE SKYDIVING NO NO, NO SIR-Y!
1:52 What even is this "stories" unit? I heard imperial system uses weird units but this is the first time I heard the "stories", no pun intended.
en.wikipedia.org/wiki/Storey
i need to clear simple concepts like why weightlessness or kind of/sort of in plane travelling at certain velocity and ISS
Before I start watching the video, I already know what freefall is. It is what happens if you reach around and your butt is not touching slide.
Astonauts are weightless cz weight=gravity*mass
Which means they have mass but not weight.
Except the Earth's gravity at the ISS's distance is still 90% of what it is on the surface. They _most definitely_ have gravity acting on them, so they have weight and lots of it.
@@ScienceAsylum They do have low apparent weight though.
I went skydiving 6 times as soon as I turned 18 and I was legally allowed to sign away my life. Skydiving is a unique and awesome experience. After you skydive once, you either hate it and never do it again, or you love it and you can't wait to get right back up there. I skydived right up until I ran completely out of money.
Skydiving is not free fall. Free fall is being under the influence of gravity and gravity alone. When you skydive, you are dealing with lots of drag, and at terminal velocity, an equal amount of drag to gravity, so the forces on you while skydiving at terminal velocity (which is the vast majority of any dive) are no different than just laying down on Earth. It is nothing remotely similar to free fall. Only the first few seconds are similar to actual free fall.
So, according to the definition, the ISS isn't in free fall because it is falling but neither in up or down direction. Right?
Correct. The ISS has some sideways motion (hence the orbit), so it's technically a "projectile."
Dr.Zakir Naik sais this is just a theory.No facts.So the science is false and lies made by the infidels to contrast the only thru
@@anderstopansson If so, why are you calling him "Dr."?!
@@mohammedal-haddad2652 I don now , he calls himself like that. What doe´s it means?
@@anderstopansson The title Dr. suggests that he is in some scientific field.
How does an accerometer work if there is no way to tell if you are accelerating?
What's proper acceleration?
Well , when I needed to poop in Bangkok down town and I realised that there was no public toilet , bar , restaurants or hiden places near by , then I felt my accelerometer starting !
I don't get why skydivers pay money to jump out of planes and countries put astronauts in the space station. If you want to fall for free just relax your muscles while standing up.
Thanks to much
Why will weight effects air resistance?
Heavier things are better at pushing air molecules out of the way.
Air resistance depends on the scale of the square surface and its form. Heavier things have more "force" to work against air friction. Is this right mister Lucid?
Free fall is experiencing weightlessness no matter if the vertical position is increasing, decreasing or remain unchanged like in a stable circular orbit.
Being bound to a solid surface is the only way to experience gravity.
You feel 1G, not weightless, when falling at a constant speed.
U r cool
Thank you
You're welcome.
Why Nick, you look so young and youthful.
Free-fall out of a plane is an experience everyone should have.... Once. Anything more than once seems to me to be asking for trouble
wow you are funny and recourseful
If gravity is uniformly accelerated then it have a constant force then gravity is a force 😁 i know I wrong but how....
In the realm of science where gravity is not a force (General Relativity), it also does not cause acceleration. In General Relativity, objects in free fall are not accelerated; they are in states of inertial motion. When you are standing on the surface of the Earth, you are in an accelerated reference frame. Objects merely appear to accelerate.
Just so you know, the SI symbol for kilometer is "Km", not "k".
But "kph" is the abbreviation for "kilometers per hour."
@@ScienceAsylum Really? Not used since 1889.
@@3d_mihai What about Kw/h Iasi ?
Since drag increases as you get closer to terminal velocity, you can never actually reach it, unless you have infinite time that is.
Technically true, yes... but you can _effectively_ reach it. You can get so close to it that you might as well just say you're there.
Cabbage Man: --Can never reach terminal velocity?
How are astronauts falling around the earth again when their always 257 miles away from earth and gravity is at 80 percent always vertical from their position? they never go up or down thanks to gravities properties they travel in a straight line no different than a plane. I asked scientists that question still waiting for an answer
It's the same way the moon is orbiting the earth. Look up circular motion.
First off, they aren't always 257 miles away. This varies because their orbits are not perfectly circular. They do not travel in a straight line. It is always an ellipse. But, let's assume their orbits are perfectly circular because it is easier to reason why orbits work that way.
Imagine you live on a planet that is perfectly spherical and has no atmosphere on it, so there is no drag. This planet has the same diameter of Earth and the same gravitational force of Earth. Also, imagine you have a gun that can shoot a projectile at any speed you wish. That gun is perfectly parallel to the ground and 2 meters high. Now, first let's just shoot something out at regular bullet speed. If you fired that bullet at precisely the same time as you dropped a bullet from the same height (2 meters), which bullet would hit the ground first?
On a perfectly flat Earth, they would both hit at precisely the same time because gravity would accelerate each bullet at precisely the same rate. They would both fall. In reality, the fired bullet would hit ever so slightly later. Why" Because it had farther to go. Due to the fact that the Earth is a sphere, and not flat, the bullet that was fired traveled across the surface, and it would have ever so slightly curved away as the bullet fell, so it would have had to go slightly farther before reaching the surface.
Now, imagine that you fired that bullet at such a speed that for every meter it fell downward, it had traveled so fast and far across the surface that it curved away by exactly a meter. That fired bullet is still falling, but since it is going so fast across the surface, it doesn't get any closer. The bullet continually falls, but the surface continually curves away at the same rate. This is an orbit. This is why rockets are so big. The only reason they go to space is to get away from any obstacles - most importantly, air. Once out of the vast majority of the atmosphere, they can shut down the engines and maintain whatever velocity they have and not worry about drag too much. This is why rockets don't blast straight up. They'd simply fall straight back down. There is nothing magical about space that allows orbits; it's just this tremendous speed that keeps them from getting closer. So, they launch straight up at first, but soon turn over and start going horizontally to gain all this speed. Getting into space is easy. They don't need all that fuel to get to space; they need all that fuel to accelerate the payload up to these enormous orbital velocities.
I would love to try and sky dive the flling of being wheight less for a second like austonauts but maybe in a smaller scale sounds exciting as well as felling all that adrenalin rush trough my sistem but This video was great it really helped me in my science lessons :3 also say hello to that alien from my part ;3
You can call me Super Ponki Milton says "hello" back :-)
If you jump out of a plane you are not really weightless because you go forward with the speed of the plane. At the moment you leave the airplane you feel air friction and acceleration. If you want to be weightless you have to jump out of a hot air ballon, in this case you start with zero speed and for the first seconds you are really weightless.
God!!. Iam now cleared with this topic😯
This is great stuff and very creative, but I can't show it to my students due to the language... sadness
Language? 😕 You mean the word "crap"??
But how to explain the acceleration for all mass objects are the same if we treat gravity like the curvature of spacetime but not a force
In the realm of general relativity, things which are stationary in a gravitational field (i.e., standing on the surface of the Earth) are in the equivalent of an accelerated reference frame. Objects with different mass APPEAR to accelerate at the same rate for the same reason objects of different mass APPEAR to accelerate at the same rate in a car when you slam on the brakes. The example most often used is a rocket in deep space far away from all gravitational sources accelerating through space at 9.8m/s². The back of that rocket would feel like the "floor" and if you dropped something inside that rocket, they would appear to accelerate at 9.8 m/s² toward the floor - when really it's the rocket accelerating the floor up to meet those objects, so they appear to accelerate at the same rate regardless of their mass.
Willoughby Krenzteinburg So the mass is even not matter at all? Just no need to consider?
@@protestant6258 Mass does not matter in either case. It doesn't matter in classical physics OR in relativistic physics.
Be aware, we are talking about gravity and gravity alone. In the real world - when dealing with air, mass is a factor.
Willoughby Krenzteinburg But what about light?
@@protestant6258 Light falls just like anything else falls. Light passing by the Earth's surface "falls" toward the Earth's surface at 9.8 m/s² just like anything else. It's just that light moves by so fast you don't notice it. It's not until you observe light from behind massive things in space that you notice this light "falling" or curving or what have you.
Actually came here trying to understand falling speeds of skydivers and skydiving formations
Skydivers are not in free fall.
You're crazy I LOVE IT!!!! 💃🏾
Why do people in international space station experience anti-gravity?
They float around because they're falling around the Earth along with the ISS. It's the same thing people experience when they fall on those rides like Demon Drop. It's just that the ISS is moving so fast sideways that it keeps missing the Earth as it falls.
@@ScienceAsylum why do they even feel weight less when they're falling?
Because you don't actually feel weight. You feel push forces against other objects. Pushes you feel against the ground are what you _think_ are your weight, but they're not. It's a mistaken perception.
@@ScienceAsylum Yes, and the reason you don't feel weight is because weight doesn't actually exist. What we perceive as weight is not different than what you would perceive in an accelerating car as you are pushed into the back of your seat. What we perceive as weight is nothing more than the result of being in an accelerated reference frame. When in free fall, you are no longer accelerated. Free fall is inertial motion. You have no weight because you never did. You only have mass. If you were in a rocket that was in deep space and it accelerated at some rate "a", then you would be pressed against a wall of that rocket, and a scale underneath you would measure a force equal to a times your mass. F=ma. The equation we have for weight (W=mg) is literally F=ma with the force specific to weight and acceleration specific to gravity. As it turns out, this weight is no more special than any other acceleration which would result in the exact same feelings we characterize as "weight".
You said that free fall has to be up or down - so you don't think orbits are free fall? I'm surprised. Is this a common viewpoint?
_Technically,_ "free fall" is only up or down. "Projectile motion" is what you'd call it if there is also some sideways motion. That's what orbiting objects are: projectiles.
That's interesting! Maybe I've learned a slightly wrong definition through reading sci fi. I expect that's quite a common problem. Thanks for the reply.
The acceleration due to gravity depends on latitude: 9.81m/s/s occurs at 45 degrees latitude.
It also depends on how dense the Earth is underneath you and all sorts of other factors... but none of those factors are very big: 9.812 one place, 9.803 another place, 9.809 another. If you round that to one decimal place, the acceleration due to gravity is 9.8 everywhere.
I never knew that you would reply.
@@oghenakogieimoedemhe6186 He does ´cause Chuck Nooris is his friend !
RIP tom petty
nick the dimension of g is m/s^2 not m/s...... it was just for my reliefment..Keep working its fabulous
I said "m/s per second" which is the same as m/s^2.
The Science Asylum hey nick why you don't have made video on string theory??
@@ScienceAsylum How dare they !
It's a sin to jump out of a perfectly good airplane.
Air and gravity are forces? 😁
OMG i finally get it!
Same
PHYSICS!!!!!!!!!!!
so cool!@#@(*&@#(
I was looking for the asylum rules you keep referancing. Perhaps a refresher of your whole deal.
I haven't shown the whole list in a while, have I? 🤔
I would skydive.. as long as I didn't die in the process...
Your profile pic is legendary :)
OMG! You made a mistake about weight!
Weight is a measurement of the force an object exerts on earth due to the force of gravity. The astronauts are weightless because they are in free fall just like sky divers are weightless until they splat on the ground. That's how the "vomit comet" airplane works to get brief periods of weightlessness. So, the astronauts are weightless but they are not "massless".
Still love your videos though.
I think this is a disagreement between physicists and engineers on what the definition of "weight" is. I'm a physicist, so I use physics definitions. You appear to be working from engineering definitions.
I want to skydive but i have too much rest mass
Legend teacher😁😁😀😀😁😁😂😂😁😁😀
Why would anyone skydive?
I would go skydiving with D.B. Cooper.
loloolololoolololool
He probably die just after the fall due to extra weight.
jokes on you my man Barry Allan can run mach 3
no
How can you be a little crazy yet only skydive if your life depended on it, sounds sane to me
Funny now that the clock doesn't move at all and with the new video even while having new text fonts you still kept the old paint-looking 9.8m/s^2. I appreciate the content but you've done much harder stuff already so fixing that shouldn't be a problem at all. I'd also like to say that I highly dislike cuts when they are not needed to spare a second of hand movement in silence, or if you have problems delivering larger sentences maybe you should address the problems and not the sypmtoms. Thank you for the share.
crushed paper fell second
Do you have PhD in physics?
I have a masters degree in physics. I never went for a PhD (even though my advisors told me I should) because I didn't feel it was necessary for me.
@@ScienceAsylum yeah you're already full of lots of knowledge and intelligence. You won't need more😂❤️
You are hilarious 😂
Whose here for the Dinner Table Discussion 7th grade??
Wrong. m/s^2
0:35 force? Gravity? What is this? Ahh OK its an old Video...
_VERY_ old.
Nah I’m going to space
my father sky dived
Oh, yuck! I can't stand when these guys try to mix science with the funny. It never works. Porn and comedy don't mix, either. There are some topics we're here to actually take seriously and learn. The humor isn't funny and just slows everything down, it hugely dumbs everything down, too. Is the audience a group of 4th graders?
Sorry. I sound like an ogre because so many science-related clips have hosts that simply can't resist trying to squeeze in their personality. It has to be a part of the video. I think they think 'you need to be personable' and 'relatable' and 'entertaining'... these are the general and useless tips people give others making videos. Sometimes you don't need to do any of those things, especially when the topic sells itself and we're all here willingly by typing related searches into UA-cam. We want to learn. We're not here for entertainment. And comedy skits turn these into cheesy entertainment bits. Do you really have to dumb these topics down for people to grasp the underlying scientific concepts? C'mon! That's absurd. Such fools aren't looking on UA-cam for anything even remotely under the umbrella of science. So just speak plainly, please!