Which is the force acting on the object ,on which the work is being done and what happens to the object?
A girl pulls a trolley and trolley moves certain distance.
Rain drops falling vertically downwards.
A man holding a heavy suitcase in his hand and walking on levelled road.

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Solution

Dear Student,

(A) A girl pulls a trolley and trolley moves certain distance.
Force(pull) is exerted by the girl on the trolley.
Work has been done by the girl onto the trolley.
Trolley moves in the direction of the force applied.

(B) Rain drops falling vertically downwards.
Gravitational force of Earth is exerted on the rain drops.
Work has been done by the gravitational force of the Earth.
Rain drops moves towards the surface of the earth under the action of gravitational force.

(C) A man holding a heavy suitcase in his hand and walking on levelled road.

Net force acting on the suitcase is zero.
Work done on the suitcase by the man is zero.
Suitcase is not moved with respect to the man.

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Question 23
A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of $4 m s^{- 1}$ by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?

A girl having mass of 35kg sits on a trolley of mass 5kg. The trolley is given an initial velocity of 4m/s by applying a force. The trolley comes to rest after travelling a distance of 16m.
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Which is the force acting on the object ,on which the work is being done and what happens to the object? A girl pulls a trolley and trolley moves certain distance. Rain drops falling vertically downwards. A man holding a heavy suitcase in his hand and walking on levelled road.

Which is the force acting on the object ,on which the work is being done and what happens to the object?
A girl pulls a trolley and trolley moves certain distance.
Rain drops falling vertically downwards.
A man holding a heavy suitcase in his hand and walking on levelled road.