5 Steps to a 5 AP Physics C 2016 by Greg Jacobs

Author:Greg Jacobs
Language: eng
Format: epub
ISBN: 0071846433
Publisher: McGraw-Hill Education
Published: 2015-08-15T00:00:00+00:00

Plugging in values for k and m, we have

vf = 0.07 m/s, that is, 7 cm/s

Power

Whether you walk up a mountain or whether a car drives you up the mountain, the same amount of work has to be done on you. (You weigh a certain number of newtons, and you have to be lifted up the same distance either way!) But clearly there’s something different about walking up over the course of several hours and driving up over several minutes. That difference is power.

Power is, thus, measured in units of joules/second, also known as watts. A car engine puts out hundreds of horsepower, equivalent to maybe 100 kilowatts; whereas, you’d work hard just to put out a power of a few hundred watts.

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