Give two examples of (i) positive work (ii) negative work (iii) zero work
Positive work -
1. Pushing a box through a distance.
2. Lift a book through a height.
Negative work -
1. Work done by force of gravity on an object when lifted.
2. Work done by friction when we walk.
Zero work -
1. Pushing a wall.
2. Walking while holding an object.