At the point of contact, work done by the normal reaction when a person climbs up the stairs is

Positive

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Negative

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Zero

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None of these

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Solution

The correct option is C Zero
As the point of application of force does not move, the work done by the normal reaction is zero.

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Q. At the point of contact, work done by the normal reaction when a person climbs up the stairs is

Q. Work done by the normal reaction when a person climbs up the stairs is:

It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s.Compare the (i) work done, and (ii) power developed by the persons A and B.

A boy of mass m climbs up the stairs of vertical height h.

(a) What is the work done by the boy against the force of gravity?

(b) What would have been the work done if he uses a lift in climbing the same vertical height?

State whether work is done or not by writing yes or no, in the following cases:

(a) A man pushes a wall.

(b) A coolie stands with a box on his head for 15 min.

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At the point of contact, work done by the normal reaction when a person climbs up the stairs is

The correct option is C Zero As the point of application of force does not move, the work done by the normal reaction is zero.

The correct option is C Zero
As the point of application of force does not move, the work done by the normal reaction is zero.