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A car comes to a sliding stop in 5 m. Du...

A car comes to a sliding stop in 5 m. During this process, the force on the car due to road is 100 N and is directed opposite to the motion.
(a) How much work done the road do on the car?
(b) How much work done the car do on the road?

Text Solution

Verified by Experts

Work done on the cycle by the road is the work done by the stopping (frictional) force on the cycle due to the road.
The stopping foce and the displacement make an angle of `180^(@) (pi rad)` with each other. Thus, work done by the road,
`W_(r )= Fd cos theta`
`=200 xx 10 xx cos pi = -2000 J`
It is negative work that brings the cycle to a halt in accordance with WE theorem.
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