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Question
A 2kg box sits on a 3kg box which sits on a 5kg box. The 5kg box rests on a table top. What is the normal force exerted by the 5kg box on the 3kg box?
A 2kg box sits on a 3kg box which sits on a 5kg box. The 5kg box rests on a table top. What is the normal force exerted by the 5kg box on the 3kg box?
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Solution
The correct option is D 49N
The mass above the 5kg box: 2kg+3kg=5kg
Force exerted by these masses will be equal to the normal force that 5kg mass is applying.
Therefore,
N=5×g
⟹N=49N
The mass above the 5kg box: 2kg+3kg=5kg
Force exerted by these masses will be equal to the normal force that 5kg mass is applying.
Therefore,
N=5×g
⟹N=49N
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