Question

Give 3 types example of Positive , Negative and Zero Work.

Answer 1

a)Examples of positive work done
1. Kicking a football         
2. Moving a chair
3. Throwing a stone 
4. Riding a bicycle 
5. Doctors moving a patient in wheel chair
6. striking a pen into another pen 
7. Riding a skateboard
8. Pushing and moving a table
9. Cutting a fruit with knife
10. A car moving forward

b)Examples of Negative Work done
1. Someone pushes you
2. You are pulled from behind when you try to move front
3. In Arm wrestling, when someone is defeating you.
4. In Tug of War when opponent team pulls hard.
5. Pushing a car up a hill, when you slip back.
6. Trying to catch a heavy object, hands move down
7. When you jump, work done by gravity is negative
8. After you press a spring, it relaxes.
9. Trying to kick a moving football, work done by ball is negative
10. A car moving  on road, work done by friction is negative

Examples for zero work:

1 coolie standing carriying bags
2 a car start and end at same place
3 a man walking here and there and stopped at sm place