Question

The wooden plank may break if someone stands on it. What will be the reason ?
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Answer 1

First law says an object at rest stays at rest unless acted on by an unbalanced force. ... Third law says that when you exert force to lift the plank (and yourself), you're also exerting equal force down on the plank, which makes those forces balanced

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Answer 2

Answer:

Newton's first and third laws, really.

Newton's first and third laws, really. First law says an object at rest stays at rest unless acted on by an unbalanced force.

Newton's first and third laws, really. First law says an object at rest stays at rest unless acted on by an unbalanced force. Third law says that when you exert force to lift the plank (and yourself), you're also exerting equal force down on the plank, which makes those forces balanced.