Physics
Monu pulls a toy car through a distance of 20 m on smooth and horizontal floor. The string field in Monu's hand makes an angle 60° with horizontal surface. If the force applied by the Monu be 10N,
(a) calculate the work done by Monu is pulling the car.
(b) If the string makes an angle 30° with the horizontal surface, then calculate work done.
Work, Energy & Power
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Answer
(a) Given,
Distance moved (d) = 20 m
Force applied (F) = 10 N
Angle = 60°
Work done (W) = F d cos θ
Substituting the values in the formula above we get,
W = 10 x 20 cos 60 = 10 x 20 x 0.5 = 100 J
Hence, work done = 100 J
(b) If angle = 30° then work done = ?
Substituting the values in the formula above we get,
W = 10 x 20 cos 30 = 10 x 20 x = 100 J
Hence, work done = 100 J
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