Question

In which of the following situations work is done?(a) A person is climbing up a stair case.
(b) A satellite revolving around the earth in closed circular orbit
(c) Two teams play a tug of war and both pull with equal force
(d) A person is standing with heavy load on his head

Answer 1

Answer:

a and b only

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Answer 2

The term ‘work is done’ requires an external force of energy to be applied with minimum distance. In this case of given four options, option ‘b’ requires no external force wherein the satellite revolving is an operation by nature.

Therefore the other options ‘a’, ‘b’, and ‘c’ requires external force:

• The person climbs up the staircase and will finish the object of why he climbed up.
• Though two teams pull with equal force, either the result will be ‘draw’ or one team will win at the end with heavy external force.
• The person who is standing with heavy load may wait for someone’s order for where to keep the load or anything, but he will use his energy to finish his object of carrying the load.

Hence, options, ‘a’, ‘b, and ‘c’ are the situations of work done.