First slide

Work

Question

A motor cycle comes to a skidding stop in 5m.If force applied by the road on the motor cycle is 500N.
Calculate the
(i) work done by the road on the motor cycle
(ii) work done by the motor cycle on the road

Moderate

A

2500J ,-2500J
B

2500J, 0
C

0,2500J
D

-2500J, 0

Solution

(i) $W=f Scosθ =500×5 \times {cos180}^{\circ} = -2500J$
(ii) S=0 as road is at rest

$W=500 \times 0=0$

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