Question

1.Pushing a stalled vehicle.

2. Catching a ball thrown towards

you.

3.Tying a stone to one end of a string

and revolving it around your head.

4. applying brakes to a moving

vehicles. In the following cases identify the type of work(position, negative, zero)​

Answer 1

Answer:

1)positive

2)Negetive

Answer 2

1. Positive, 2. Negative, 3. Zero, 4. Negative

• WORK DONE is positive when force and displacement are in the same direction.
• WORK DONE is negative when force and displacement are in the opposite direction.
• WORK DONE is zero when force and displacement are perpendicular to each other.

1. While pushing a stalled vehicle, force and displacement are in the same direction to each other.

Hence, work done is positive.

2. While catching a ball thrown towards you, force and displacement are in the opposite direction to each other.

Hence, work done is negative.

3. While tying a stone to one end of a string and revolving it around your head, force and displacement are perpendicular to each other.

Hence, work done is zero.

4. While applying brakes to moving vehicles, force and displacement are in opposite direction to each other.

Hence, work done is negative.

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