The rule here is: use known values as more as possible. DO NOT use intermediate values unless you have no choice. So for the problem (a), acceleration is unknown. We need to use the equation with a and other known conditions. That is we need to find out which equation has a, delta x, t, and Vi? Clearly it is: delta x = Vi*t + 1/2*a*t^2. For problem (b), Mr. P said there are 3 ways to solve Vf. But there is actually only one way to do it correctly without rounding problem. It is the last equation, delta X = 1/2*(Vf+Vi)*t. You don't need the answer from (a) to solve (b) and it is more accurate.
I used unrounded answer! By the way, I haven't seen a video in quite some time...After graduation, I was so busy😭I wanna study physics comfortably some day....
No, because they have different units. If the units are inconsistent, the equation is not valid. In this case, the equation shows displacement minus (velocity * time). Multiplication takes precedence over addition and subtraction, so it is implied that you first multiply velocity with time, before subtracting it from displacement .
i used the unrounded answer for all the decimal (starting with 6.3611) which gave me a= -4.801407 and my Vf was 1.4325955 so im just confused if this is wrong or if its just different bc you used the rounded number from the beginning? the lesson itself is rlly helpful tho so thank u
these videos deserve so much more views and likes. amazing job
I'm thinking the same thing. This channel should have more subscribers
thank you so much, sir. your short videos helped me understand what my teacher can't explain properly for an hour
I finally understand how to look at a UAM problem and work it on my own due to this lesson. Thank you very much.
The rule here is: use known values as more as possible. DO NOT use intermediate values unless you have no choice. So for the problem (a), acceleration is unknown. We need to use the equation with a and other known conditions. That is we need to find out which equation has a, delta x, t, and Vi? Clearly it is: delta x = Vi*t + 1/2*a*t^2. For problem (b), Mr. P said there are 3 ways to solve Vf. But there is actually only one way to do it correctly without rounding problem. It is the last equation, delta X = 1/2*(Vf+Vi)*t. You don't need the answer from (a) to solve (b) and it is more accurate.
I used unrounded answer! By the way, I haven't seen a video in quite some time...After graduation, I was so busy😭I wanna study physics comfortably some day....
It is good to have you back. I hope you can keep learning physics.
That was really helpful! Is there a video that explains or derives the equations?
I have these two:
www.flippingphysics.com/uam-derivative.html
www.flippingphysics.com/kinematic-equation-derivations.html
@@FlippingPhysics Thank you!!
9 yrs later your still helping a G9 student
at 5:29 is it ok?,
to subtract speed from distance?
No, because they have different units. If the units are inconsistent, the equation is not valid.
In this case, the equation shows displacement minus (velocity * time). Multiplication takes precedence over addition and subtraction, so it is implied that you first multiply velocity with time, before subtracting it from displacement .
These are awesome dude! NICE job!
i used the unrounded answer for all the decimal (starting with 6.3611) which gave me a= -4.801407 and my Vf was 1.4325955 so im just confused if this is wrong or if its just different bc you used the rounded number from the beginning? the lesson itself is rlly helpful tho so thank u
Awsm....
thx
flipping phyiscs!!
Sing it!
mmmmm shallow and pedantic
Bro, what.