What Is Power? | Physics in Motion

We learn how power relates to electrical and mechanical systems. We explore the multiple ways we can express power mathematically by working through an example problem that ties in Newton's second law and kinematic equations to find its solution.

[Chaelisa]

This is so underrated!! Great work!! :)

[keitht]

In the accelerating car scenario, the (total distance)/time value would be one half of the final velocity. So the power of the car would work out to be one half of the value shown. Values shown correspond to a 0 to 60 mph time of 5 seconds, a 2200 pound car, (a fairly small car) and a 195 hp engine, so it seems like that should be correct. Sounds realistic. But in the hypothetical scenario (not including wind resistance, and a constant force and constant acceleration) an engine half that size (in power) would get you to that speed in five seconds!

[ardayilmaz]

the answer to the example problem is wrong. You are multiplying force with final velocity (27 m/s * 5400 N ). You gotta multiply with average velocity (13.5 m/s * 5400N) which is half of the answer you give.

[michellerobinson]

The answer to the problem at the end is wrong. Will this be addressed?