Question

State the nature of work done in the following cases.

1) work done by a force in lifting a heavy book from table​

Answer 1

Answer:

Positive

Explanation:

Work done by a force in lifting a heavy book from table is positive, as the force causes the displacement of object in same direction.( as force acts upwards and the book displaces upwards).

Also angle between force and displacement is 0°.

==> cos0°= 1

==> F. s. costheta= F. s. = positive.

Thus the Work Done is positive.

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Answer 2

Answer:

positive.................