Question

A cyclist comes to a skidding stop in 10 min. During this process, the force on the cyclist due to road is 200 N and is directly opposed to the motion.
a) How much work does the road do on the cycle?
b) How much does the work does the cycle do on the road?

Answer 1

Answer:

Answer : -2000J

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 force and the displacement make an angle of 180∘ (π rad) with each other.

Thus, work done by the road,

Wr=Fdcosθ

=200×10×cosπ

=−2000J

Explanation:

Answer 2

HEYA MATE HERE U GO.

❤. The stopping force and the displacement make an angle of 180 degree with each other.

Thus, work done by the road ,

Wr = Fd cos theta= 200 × 10 × cos 180degree = - 2000J.

❤. From Newtonś Third Law , an equal and opposite force act on the road due to the cycle .Its magnitude is 200N .However , the road undergoes no displacement.Thus, work done by cycle on the road is zero.