Consider a porter standing on a platform with a suitcase which presses his head with a force of 200 N. If this force is taken to be action, then the reaction force is exerted by:

The head on the suitcase.

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The earth on the suitcase.

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The earth on the porter.

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The suitcase on the earth.

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Solution

The correct option is A The head on the suitcase.
When the suitcase is pressing the person's head, it is acting a force on his head. As stated by Newton's Third Law of motion, if there is a force, there must be an equal and opposite reaction force. Therefore, the reaction force is applied by the head on the suitcase.

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Q. Consider a porter standing on a platform with a suitcase which presses his head with a force of 200 N. If this force is taken to be the action, from where is the reaction force exerted and to where is it directed ?

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Q. In which of the following cases is the work done positive or zero or negative?
a) Work done by the porter on a suitcase in lifting it from the platform on to his head.
b) Work done by the force of gravity on suitcase as the suitcase falls from porter's head.
c) Work done by the porter standing on platform with suitcase on his head.
d) Work done by force of gravity on a ball thrown up vertically up into the sky.
e) Work done by force applied by hands of a man swimming in a pond.

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