Question

in which of the following examples, the work done by a body is non-zero.
1. A man reading newspaper on a chair
2. A boy walking to his school
3. A man pushing a wall
4. Boys playing football
5. A man holding a suitcase in his hand and
6. Girl singing a song
waiting at the bus stop​

Answer 1

Answer:

1. non-zero

2. non-zero

3. non-zero

4. work is done

5. non-zero

6. non-zero

Explanation:

work done = force×displacement.

In 1,2,3,5,and6 force is applied but there is no displacement.

In 4 work is done bcoz force is applied and displacement happens.

Hopefully it will help you !

Answer 2

Since,
Work Done=force x displacement
So if displacement =0, Work Done is also 0


1. Work Done=0
This is bcoz there is no net displacement

2.Work Done=non-zero
There is net displacement

3.Work Done=0
There is no net displacement

4.Work Done=non-zero
There is net displacement

5.Work Done=0
There is no net displacement

6.Work Done=0
There is no net displacement

Hope it help :)