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Question

When a body is placed on a surface, the body exerts a force downwards on the surface equal to its weight on the surface, but the body does not move because

A
The surface exerts an equal and opposite force on the body normal to the surface.
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B
The surface exerts an equal and opposite force on the body parallel to the surface.
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C
The surface exerts no force on the body.
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D
The surface exerts an infinite force on the body parallel to the surface.
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Solution

The correct option is C
The surface exerts an equal and opposite force on the body normal to the surface.

When a body is placed on a surface, the body exerts a force downwards on the surface equal to its weight on the surface, but the body does not move because the surface exerts an equal and opposite force on the body normal to the surface which is called normal reaction force.


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