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  • A book exerts a force of 2N downwards, into a chair that exerts a force of 5N downwards to the floor it stands on. What is the force (in N) that the floor exerts upwards on the chair?  

A book exerts a force of 2N downwards, into a chair that exerts a force of 5N downwards to the floor it stands on. What is the force (in N) that the floor exerts upwards on the chair?
 

Option: 1

7


Option: 2

0


Option: 3

2

 


Option: 4

5


Answers (1)

\\ \text{By Newton's third law, for every reaction there is an equal and opposite reaction. The floor must exert a 7N force upwards on the chair for the system to remain at rest.} \\ \text{If it exerted less than that, the chair would be accelerated into the floor. This force, exerted by a surface, perpendicular to it, is called the normal force.}

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Ramraj Saini

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