Question

wergies?
From the following activities listed below, state whether or not the work is done. Give reasons
ilso. (a) An apple is falling off a tree.
(f) A man is holding a bucket of water.
(b) A girl is pushing a book on a table. (g) A coolie is lifting a load on his head.
(c) A horse is pulling a cart.
(h) A cat is flying due to moving air.
(d)Sunil is reading a book.
(i) A man is climbing the stairs.
(e)A man is pushing a wall
( j) A ball is thrown upwards in the air.

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Answer 1

Explanation:

1. an Apple is falling of tree here work is done as the Apple changes its position
2. A man is holding a bucket of water no work is done here because there is no displacement
3. girl is pushing a book on the table here work is done as the book is displaced
4. Coolie is lifting a load on his head here no work is done becoz the force is acting in the perpendicular direction so there is no displacement
5. horse is pulling a cart here work is done as the horse is moving and it is displaying the cart
6. Sunil is reading a book here no work is done as there is no displacement
7. A man is climbing the stairs here work is done
8. a man is pushing the wall here no work is done as there is no displacement
9. ball is thrown up in the air here no work is done becoz force is applied on the ball is in the perpendicular direction