When a body is placed on a surface, the body exerts a force in _________ direction on the surface. Fill in the blank.
A
Downwards
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B
Upwards
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C
Both A and B
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D
None
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Solution
The correct option is B Downwards 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 forwent he body normal to the surface, which is called normal reaction force.