Question

give two examples each for positive and negative work done by a force

Answer 1

Here is a list of some examples of work done.
Work done is divided into:
a) Positive Work done and b) Negative Work done

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

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Answer 2

Work done is divided Positive Work done and Negative Work done
Examples of positive work done
Moving a chair
Throwing a stone
Riding a bicycle Doctors moving a patient in wheel chair
striking a pen into another pen
Pushing and moving a table
Cutting a fruit with knife
A car moving forward

Examples of Negative Work done

You are pulled from behind when you try to move front
In Tug of War when opponent team pulls hard.
Pushing a car up a hill, when you slip back.
Trying to catch a heavy object, hands move down
When you jump, work done by gravity is negative
After you press a spring, it relaxes.
Trying to kick a moving football, work done by ball is negative
A car moving on road, work done by friction is negative

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