Question

can you give me the examples of positive work done,negative work done and zero work done?

Answer 1

Positive work.done
1. Lifting a school bag
2. Walking.

Negative work
1. Work.done by gravitational force on lifting a bag.
2. Work done by friction on moving body.

Zero work.done
1. Work.done by sun on revolving planets
2. Work done if u cant move a wall.

Answer 2

Answer:

a)Examples of positive work done

• a)Examples of positive work doneKicking a football.
• Moving a chair.
• Throwing a stone.
• Riding a bicycle.
• Doctors moving a patient in wheel chair
• striking a pen into another pen.
• Riding a skateboard.
• Pushing and moving a table.

b)Examples of Negative Work done

• b)Examples of Negative Work doneSomeone pushes you.
• You are pulled from behind when you try to move front.
• In Arm wrestling, when someone is defeating you.
• 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

(c) examples of zero work done

• If a block is moving on a smooth horizontal surface, no work is done
• You are carrying two bags in your hands and not moving . ...
• A person holds a bundle of hay over his head for 30 minutes and gets tired. ...
• If you push a wall , but it does not move . ...
• You sit on a chair for hours .