AP Physics 1 review of Energy and Work | Physics | Khan Academy

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

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[adityasharma]

I wish I had watched it before.
This is like a quick recap of all concepts which is very helpful

[DMGInfinityWarrior]

bruh moment im boutta fail teacher did not prepare me for this exam

[starrynavii]

tysm i have a test tmrw on this unit and this video covered everything :)

[boss]

Mathematically for the last question, you can do P = Fd/t, and since the question focuses mainly on the force of gravitation, and because the force of gravitation depends on theta, you can write the force of the diagram on the left as Fsin2theta and the diagram on the left as Fsintheta and because Fsin2theta>Fsintheta, you can clearly say that the power of the diagram on the left > than the diagram on the right. Furthermore, it makes sense because if it has a larger force of gravitation then it'll take less time to get to the bottom at a higher speed. The reason I'm including this explanation is that I feel like his wasn't that great and if you were asked to explain this on an FRQ, he definitely wouldn't get all the points for that explanation.

[jeffchadwick]

I have a question: Thinking about a vehicle accelerating from 0 to 60 and then slowing from 60 to 0. Is the energy to accelerate the vehicle from 0 to 60 the same as the energy to slow the vehicle from 60 to 0? ... I contend that more energy is required to accelerate to 60 than is required to slow the vehicle to 0. The reason for my conclusion is that wheel and bearing friction must be over come to accelerate the vehicle, while the same friction assists with slowing the vehicle. Therefore the energy required to slow down the vehicle is less than the energy necessary to accelerate the vehicle. ... What do you think?

[jayj]

My AP teacher is making us do one-pagers on a bunch of these videos, the problem is I already took the scammy AND scummy AP test. :)) I don't want to do this anymore. I just want this school year to end. I hate physics. :D

[anilprasad]

Very helpful video! I just had a question.The question shown at 3:46 was referring to the system consisting of only the box, so if that is only KE, would the TME of the system A) increase then decrease or B) decrease the entire trip? I would assume that because it goes down the ramp it first picks up more velocity (thus more KE) before KE decreases. I could be wrong of course. Thanks a lot!

[phi]

the work energy example equals 20J not -40J since the initial velocity equals -6 to the left and the final velocity equals 4 moves to the right.

[lilyj.]

My exam is in two hours and I’m actually gonna get a 2

[potchidochi]

I'm screwed I have an exam in less than 30 mins

[edog]

AP exam retake in 3 hours because CollegeBoard doodoo