A Basic Acceleration Example Problem and Understanding Acceleration Direction
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- Опубліковано 4 чер 2024
- Looking for AP Physics 1 study guides, multiple choice problems, free response question solutions and a practice exam? www.ultimatereviewpacket.com/...
This video starts with a simple acceleration problem and then addresses a commonly held misconception that a negative acceleration always means you are slowing down. I do this by way of examples. Kate (my wife) drove the Prius with a camera suction cupped to the window and videoed me riding my bike several times. In the end I ended up with four different examples on the screen at once and 25 different video layers to describe it all. I am really proud about how well it worked. Enjoy.
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0:00 Intro
0:26 Reading the problem
0:40 Seeing the problem
1:14 Translating the words to Physics
1:54 Solving the problem
3:50 Why is the number on the bike positive?
4:48 How can the bike be speeding up if the acceleration is negative?
5:50 Comparing velocity and acceleration directions
7:28 All four bike examples on the screen at the same time
7:53 Why isn't there a direction on our answer?
8:51 Outtakes or how the bike riding was filmed
#Acceleration #Direction #Bike
I love visual real life examples, it makes everything a lot easier for me to understand
I must admit, this 9 minute video is a lot better than my college professor's hour long lecture on the same topic...
The effort he took for this is just🔥🔥
I must also admit, your comment makes me both happy and sad at the same time.
Hey, I was searching for videos explaining directions of velocity and acceleration and I found this. I am really really so glad I did. This video is awesome, you have put a lot of effort into this with real life example and interactive questioning and really good explanation. I cannot believe that all this was 8 years ago and I am quite surprised that this video or your channel hasn't grown much. Your channel is seriously underrated and you have earned a new sub. Thank you from the bottom of my heart.
You are absolutely welcome!
Thank you so much! I was struggling with this concept in my textbook. The bike example helped me alot. It was a good visual
You are welcome!
you put a lot of effort into this great job man
Fellow Physics teacher here. I just found your channel and watched four videos in a row and found them all really funny and thought that they explained the contents in a very light, but perfectly understandable and logical way. Congratulations on having found a setting that is so hilarious (the four copies of you in different clothes & characters, mimicking class interactions) that it immediately captures the viewer's attention and creates a live class atmosphere that allows for a natural flow of Q&A. I can only imagine how much time and effort you must have put into all these videos and just want to thank you sincerely for this, in the name of Physics didactics in general and also in my own name (I will definitely use this material in future classes to point certain things out and visualize them!) and in the name of my students in particular, who will be very soon introduced to your channel for review purposes... :) There is so much Maths stuff out there, it is usually no problem to find good review pages and explanations on most common Maths topics to recommend to students who want to review & practice a topic at home, but in Physics this can sometimes be very difficult. Therefore I'm really excited that you provide such excellent & funny review material here. May I ask if you ever received a didactics award for this? Honestly, by quality this is right up there with many major resources like www.physicsclassroom.com, www.leifiphysik.de (in German) and even the legendary Walter Lewin lectures. Excellent work! Thank you so much - in Lewin's words - for the love of Physics. :)
Wow. What a lovely comment. Thanks for all your kind words. You give me high praise.
With regards to didactics awards, no, unfortunately, I have not received any. Perhaps you could nominate me for one? That would be wonderful.
Also, you do not have to imagine how much time and effort I put into these videos. You can watch the process here: flippingphysics.com/making-a-video.html
I hope you and your students enjoy the videos!
@@FlippingPhysics I think I have actually never written any comments on UA-cam before, but here I just had the feeling that I need to tell you as a colleague how much I admire your dedication to your work. Your students are clearly very lucky to have you as a teacher, some parts in the first introduction videos about learning together and not focussing on other people's mistakes but rather on your own learning (in the video on rounding/sig. fig.s) also tell me that you really care about a positive learning atmosphere, which I also find very important in my class. Physics is beautiful and we need to include as many interested people as possible in this wonderful science without making anybody feel bad or stupid because he/she doesn't understand a concept on first glance. Unfortunately I am not a member of any committee that decides about recommendations/nominations for Physics didactics awards - but if I ever hear of any Physics didactics award where nominations can be submitted by anyone, I will definitely recommend you/your page. I believe you highly deserve such recognition for your work on this brilliant project - something beyond the praise of fellow Physics teachers... ;) Thank you as well for the link to the video, I'll watch it right now. In general, I think I will pass the next few weeks slowly working through these excellent materials that you have created. I might also write you an e-mail some time soon - maybe I'm able to give back to you with a few ideas/demonstrations that worked out very nicely for me and made for some very fun classes... :) I'll also try to translate/caption a few of your videos in German & Spanish if there is still a need for that (I better leave Portuguese & French to others who are more fluent in these languages). Kind regards from the Swiss School in Querétaro, Mexico - Arne (that's me).
Arne, Thank you for paying for the blue bucket, that is much appreciated! I would love it if you could translate some captions to Spanish and/or German, there is always need for that. I hope students at the Swiss School in Querétaro enjoy learning with me!
So much hardwprk fr a video ...thnks😊
an amazing able bodied educator going to such lengths to explain a usually complicated concept in a short video for everyone to enjoy
These are really well done and very watchable. Good job, keep making these!
You clarified this so well for me. Very cool the kids get to learn early on.
Really a good explanation..... I don't think anything could better explain it than this video.... Thnq so much ❤
Thank you so much for your excellent explanation.
You are welcome!
Thanku beautiful example u made this concept very easy
This was a really good video! Thanks a lot!
Thank you so much for the illustration. Hope all is okay for you and your family during this ongoing pandemic. I will remember to share this video with my students!
Please do!
You are a superb teacher. 👌God bless you.
Very strong and nice example
Thank you so much for this video! I was able to get a 100% on my quiz thanks to this. I really appreciate your clear examples and were able to answer all the questions I had! Thanks again❤❤
You are welcome!!
Thank you so much for these wonderful videos!! I will absolutely be recommending your channel to my students. You’re so much fun, I imagine your students really look forward to your class. I remember my eighth grade science teacher was funny and entertaining in this same way, and even 40 years later I remember that class fondly. I’m sure you will be remembered by your students all their lives, and I hope I’m even half as good at teaching as you are. 🏆🙌💖👩🏫
I have a question, is it possible to add Velocity initial and final, and then do the conversion or do you have to convert them separately and then plug them in the equation ?
Very very nice explanation
It's like u have worked bloody hard for your students,thank u so much n lots of love from India.🥰🥰🥰🥰
Bobby's quastion was my question! As I always feel, you seem to be very dedicated to making videos. And the video is very helpful
That makes me happy. Thanks!
This is such a great video - thank you!
You are so welcome!
I had doubts about this topic, now only because of you I got them all cleared
You need to give yourself credit here too. You are working hard to make sure you understand the material.
Flipping Physics In the last two-day I've watched many of your lectures. Your way of explanation makes the topic more easier. I'm enjoying my physics class now. :)
I SIMPLY CANNOT THANK YOU ENOUGH FOR THESE
YOU ARE WELCOME
Thanks really helpful video
Mr. P, I’m blown away by your ability to think ahead.
“yeah, I guess we should talk about that, it is in the title of the video.”
Genius.
And when Bobby moves out from behind the bike shot at 5:54
That was probably really simple to do, but you did it well and I’m blown away by it. Lol.
Thanks. I particularly enjoy putting little things like those in the videos. Glad they are appreciated!
@@FlippingPhysics woah!! Thank you for responding :D
I’m about to start AP Physics this year and my teacher is using your videos to introduce the concepts. Thank you also for making it fun and easy to understand.
Best of luck this year and you are absolutely welcome!
Great work
Excellent.. Good job bro
Sir thanks for this video I got the answer which I was searching for an hour.
this is great! every time i forget about what is acceleration, i just have to find this video, althought its kind of too long, its detail tho :D
really big thumbs up .. a big new subscriber .. thanks for all the hard work .. you are the best !!!
Glad you find my work helpful!
Thank you Prof.
You are great. Still, I just imagine this, Video was uploaded 8 years ago but the style of narration is pretty. Seems like new and I really salute your effort to record of each video.
Thank you so much and Take love from Bangladesh🇧🇩🇧🇩🇧🇩
Thanks for the love my friend!
I love you man, seriously.
Hey I am in the middle of reviewing for my test for my college 201 physics class. I know you uploaded these videos a long time ago but I wanted to say thanks. Your video playlist here is helping me clear up alot of misunderstandings that I have been having. Also, you could of just flipped a single video to get an opposite direction, haha.
While it may be true that I could have flipped a single video several times to make this, that would not have been nearly as much fun.
U sir are a genius I'm taking physics 11 to upgrade in canada and im 40 years old looking to do powerr engineering awesome explanation im sticking with you for sure bro cheers subscribed
Best of luck with engineering!
I love this channel🥺🥺
It’s feels good to be loved.
Great video
i love your videos soo much, you give real life examples, that clear my questions.
lots of love and respect from pakistan................
Wonderful!
Great video 😄
Mr. P if we use Sig. Fig. the final answer should be -6 m/s East? Because 10km/s has 1 Sig. Fig.
you're amazing!!!
Thank you so much!! My physics exams are tomorrow :)
Your video just tickled me to the core! Your kids are precious! Thank you so much for taking the time to clear up a very confusing concept for me. I love my Physics class though the concepts tend to go way over my head. Videos like these are a Godsend! Kudos!
Thanks for your lovely words Sweetie Pies Glad I can be of help!
Wow great video!!! I love physics and just started to attempt to learn it on my own and now I probably can thanks to great UA-camrs like you
Thanks! Glad you know you love physics. Hopefully I can help you grow that love with more physics knowledge. 😊
Flipping Physics I had just one question: What is the reason why we have the rule that when an object slows down, the acceleration goes in the opposite direction? I know that velocity (and all vector quantities) are direction-conscious, but is there a way to visualize the reason why we have this rule?
aquagem baby Really, just one question? The "reason why" the acceleration is in the opposite direction from the velocity when an object slows down comes directly from the equation for acceleration. Acceleration = (velocity final - velocity initial) / (time final - time initial). Assuming you live in the universe I do and time always moves forward, (time final - time initial) will always be positive. Any values you plug in for (velocity final - velocity initial) will illustrate that an object that is speeding up will have an acceleration in the same direction as the velocity and an object that is slowing down will have an acceleration in the opposite direction as the velocity.
If you watch my video ua-cam.com/video/0kQrz4dfxDw/v-deo.html and pay close attention to the magnitudes and directions of the acceleration and velocity vector arrows in the illustrations, that should help with visualization. There is one example where the ball is speeding up and one where it is slowing down.
Ohh I see so it is simply b/c time does not go backwards? Thank you!
In the video you linked to, an object slowing down can still have acceleration initially correct? Like the second example of the ball?
Also, "Uniformly Accelerated Motion" is this the same thing as "Constant Acceleration"?
although i know the concepts of physics really well, this was still fun to watch😂
wow this is great
i am flipping because of incomplete graphics in my physics module, thank you so much for this
This explanation worths millions of dollars 😭😭
I'll take it!
Help me flipping physics😄.
What is the acceleration and when an object moving with constant velocity of 10 metre per second and it changes its direction then what will be the acceleration?
For example object is moving with 10 metre per second and it changes its direction but speed remain constant 10 metre per second what will be the acceleration?
When bike slowing down means bike moves at right its acceleration wil be at left ,as there will be some force that it compel to left??
Given a bike initially moving to your right (suppose you are a stationary observer on the sidewalk). When it is slowing down, the net force on the bike acts to your left. This is could be the traction pushing backward on the tires as a result of the rider applying the brakes, or it could be air drag pushing backwards on the frontal area of the rider + bike. Or a combination of the two.
You could achieve the same result, and visualize it, if the cyclist were tethered on a flexible rubber cord on your far left side to a fixed object. The cord is initially slack while the cyclist pedals up to speed, and then the cyclist coasts once the cord starts to tense. The rubber cord pulls against the rider's motion as it stretches. Here, you can see that the rubber cord is pulling leftward on the cyclist.
Disclaimer: I don't recommend actually attempting this bike & tether experiment. I recommend considering it as a thought experiment, or trying a scaled down version with toys, and less risk of injury.
Thanks!
Great!
I have a question Flipping Physics I am having trouble with negative/positive acceleration with dots and arrows that go up and down as opposed to left/right. I.E if I have a series of dots going downward and the arrows are short and progressively get longer is that acceleration in a negative direction? Or say if the dots are long and get short going upward? I hope my question makes sense.
Hmmmm. Dots and arrows. My assumption is that the dots identify the location of the object and the arrows represent the velocity of the object. I think I have a video which will help answer your question. ua-cam.com/video/0kQrz4dfxDw/v-deo.html I use a basketball instead of dots and I have arrows for both velocity and acceleration. Because the acceleration is constant and down the incline, this is actually just like it would be in the vertical direction, there would be a constant downward acceleration (in free fall). Hope the video helps.
Oh my goodness Flipping Physics yes this is exactly what I needed! Thank you, thank you you're awesome!
Sweetie Pies Happy Face!
So are you assuming that positive displacement is to the right? Thats why when you speed up to the left velocity is negative and acceleration is negative?
Yes. By convention right is positive and left is negative.
Thanks! :)
Hi sir ! I love your videos. Please tell that does the acceleration always decrease when the velocity is decreasing ? Because it is called deceleration which I think increases when the velocity decreases. 🤕😵
I purposely avoid using the term "deceleration" because it does not really mean anything. As shown in the video, an object can have a negative acceleration and be speeding up if it is moving in a negative direction.
@@FlippingPhysics So if a body is moving with decreasing velocity which means that its velocity is changing which is acceleration (acceleration = change in velocity ). How can we define this acceleration ?
Thanks newton
In the last part, what is the direction you're talking about? We know that the negative sign by convention means left.
I am comparing the direction of the velocity and acceleration.
Speeding up, velocity and acceleration are in the same direction.
Slowing down, velocity and acceleration are in opposite directions.
Please can any one write me compare positive and negative
I cannot thank you enough. I was so confused in class.
Glad to help. Sorry you were confused. Fear not, I've got a lot of videos here to help you out!
@@FlippingPhysics many thanks! I have a question tho, I do understand everything you said in the video, but I don’t understand why when an object is speeding up both velocity and acceleration have the same direction but when it’s slowing down they have opposite directions.
I think this visual representation will help: www.flippingphysics.com/understanding-uam.html
Thx alot 💗
You are welcome!
thank
Mr .p in this problem accelaration is 0.41m/s2 to the left because in this problem you increased your velocity in the left direction
So there's a negative and positive just because this is charted on a graph? In reality, when you're speeding up, and I'm standing on either directions of you while you're speeding up, is there actually a negative and positive difference? I don't get that. It just depends on frame of reference and direction?
The whole concept of negative and positive with regards to the direction and object is moving is always relative to a frame of reference. Otherwise what would "negative" or "positive" even mean?
When you look on one side you could see + acceleration ( seems to be right )and if you see on other side you would see - acceleration ( seems to be left )
I am confused on the negative and postive acceleration, flipping physics. So if you go to the right, are you positive no matter if you go fast or slow? Same goes with going to the left, if you are negative no matter if you go fast or slow? Thank you!
+BIG LFC A positive velocity means the object is moving to the right (regardless of speed). A negative velocity means the object is moving to the left (regardless of speed).
Note: Up, North and East are positive. Down, South and West are negative.
Also Note: These positive and negative directions are simply common conventions.
Thank you! I have one more question. Why is it when velocity is negative and slowing down, acceleration is positive.However when velocity is positive and slowing down, acceleration is negative. Does velocity affect if acceleration is negative or positive? Thank you!
+BIG LFC It comes down to the equation for acceleration, which is very hard to describe in a UA-cam comment, which is why I make these videos. Look at the way it works out in the equation in this video and then plug in some numbers for each of the two examples you propose and see what happens.
ohhh, i see it now. Thank you so much!
+BIG LFC You are welcome.
And efforts ..,...... especially
"It is possible that an object can be increasing in speed when its acceleration is decreasing as in case of a raindrop" Can you explain this statement
For example, when a raindrop first falls out of the cloud, it's speed is 10 m/s and its acceleration at first is 9.8 m/s^2. This means that its speed increases 9.8 m/s per second. So at 1 second, its speed is 10 m/s. At 2 seconds, its speed is 19.8 m/s. At 3 seconds, its speed is 29.6 m/s. But because of air resistance, its acceleration decreases to 5 m/s^2. So at 4 seconds, its speed is 34.6 m/s. At 5 seconds, its speed is 39.6 m/s. Thus, the raindrop is isn't accelerating as fast but its speed is still increasing.
I like Cassie's explanation. I have not checked the numbers, however, the basic concept is correct.
Hey is this the same guy for all 4 people? If so I want to learn how to do that to videos
flippingphysics.com/making-a-video.html
Thank you very much for your reply; there are not a lot of youtubers that would take the time to do that and I think that's really awesome of you (:
Here's a doubt so in the negative velocity case negative acc. Is not equal to retardation as retardation is slowing down
If not given, the choice on which direction to assign as positive is an arbitrary choice you can make as you see fit, on a problem-by-problem basis. Or it might be given to you in the problem statement, in an effort to make the assignment easier to grade.
In this case, it appears Mr P. purposely specified a sign convention opposite of what I would choose to assign. He assigned the positive direction to be toward the back of the bicycle, even though no kinematics quantities happen in that direction, and no compass direction was specified to go with it. The velocity is in the negative direction, and so is the acceleration, based on the specified sign convention.
The fact that acceleration is negative does not necessarily imply that the bicycle is slowing down. It just means that the acceleration is in the direction we arbitrarily chose to consider negative. In order to conclude whether an object is speeding up or slowing down, we would have to know the direction of both the velocity and acceleration that happen in the same time interval. If both are in the same direction, it is speeding up. If both are in opposite directions, it is slowing down.
Obviously, I cannot speak for Mr P.'s intent, but to me it appears that he purposely specified a negative direction of motion, to demonstrate this common misunderstanding about what negative acceleration means.
.......Something's wrong here, based from my nursery understanding.. In the video the bike was moving or going or speeding up to the left because the person taking the video was on the left side of the road.. What if there was another person taking a video on the other side of the road, that would mean that the bike was going to the right based from his reference...
Another thing.. so when you go out from your house every morning, all the cars that you see that that go to the left with high speed are all in negative acceleration?? and all the cars speeding up to the right are in positive acceleration??
Please explain,.. I got confused... Thanks...
You are absolutely correct. "Positive" and "Negative" depend on your frame of reference. Always stick with ONE frame of reference when working a problem.
I was going to jump in here and explain but it seems like Carl all ready did. Yes Chesley with all of these problems, well with physics it's self it is about your frame of referance. This is a very relitive point towards how Einstein discovered the Theory of Relativity. When you are deriving something, or in other words finding a solution, you have to take into consideration frame of referance.
THANK YOU! THANK YOU! THANK YOU! I AM NOT DUMB I UNDERSTAND FINALLY!!!!!!!!!
YOU ARE WELCOME!!!!!!
Sir...negative value of force implies what...
Negative value of the net force implies that the object has an acceleration in the negative direction. I.e. in the direction that is opposite the direction we assigned arbitrarily as positive.
Negative value of just one force doesn't imply anything, since just one force is not enough information to conclude the net force acting on the object. There could be several different forces acting on the object. Maybe they add up to zero, maybe they add up in a completely different direction.
I laughed too hard at the velocitimeter gohd i hope i spelled that right haha
I understood Nothing but still good video
👍👍👍👍
😎😎😎😎
is it one guy?
yes u idiot
Did no one else look at his socks? I just realized this is from 2013. lol
That teacher broke the 4th wall...
i just realized there all the same person
who are the same person?
the person that is the same but not the same and will not be the same but is the same
wasting my time watching this they are talking too fast and i understand nothing
Try turning on subtitles. Reading might help with understanding.
ok but i hope that u talk a little bit slower next time@@FlippingPhysics
Why is the velocity negative when we are moving left :/
Cause left indicates negative direction.