Question

A child pulls a toy bus through a distance of 8 m on a smooth horizontal floor. The string held in the child's hand makes an angle of ${60}^{\circ }$ with the horizontal surface. If the force applied by the child is 3 N. Calculate the work done by the child in pulling the toy car.

Answer 1

Displacement s $=$ 8 m
angle $\theta ={60}^{\circ }$
Force F $=$ 3 N
Work done $W=F\times scos\theta$
$=3\times 8\times cos{60}^{\circ }$
$=3\times 8\times 1/2$
$=24\times 1/2=12$
$\therefore$ The work done by the child to pull the toy car is 12 J