Question

1) In the following example determine the direction of force and of displacement
Identify positive, negative or zero work done by applying the force
i)Pushing a stalled vehicle.
ii) Tying a stone to one end of a string and swinging it round and round by the
other end of the string.
iii) Catching a ball thrown by a friend.
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Answer 1

Answer:

1. Positive Work

2. Zero

3. Negative Work

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Answer 2

Explanation:

1. Pushing a stalled vehicle:  Positive Work done.
2. Tying a stone to one end of a string and swinging it round and round by the other end of the string: Zero work done.
3. Catching a ball thrown by a friend: Negative Work