Question

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Answer 1

Answer:

5. the work will be positive when there is movement in forward, the work will be negative when the body is moving backward.

Answer 2

I) the work done on an object is said to be positive work when force nd displacement are in same direction

e.g. when an object moves on horizontal surface, force nd displacement acts in forward direction. So, work done is positive.

ii) the work done is said to be negative when force and displacement are in opposite directions.

e.g., when an object is thrown upward, the force CTS in downwards directions whereas displacement acts in upward direction.

As work done is given by formula f×s nd force nd displacement is in opposite directions. Hence the work is negative work done i.e. against the direction force.

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