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This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.

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Why is the normal force a hypotenuse of the weight force? Isn't it a component of the weight...

Then resolve the forces in those two axes. Finally equate the forces along the hypotenuse to achieve equilibrium. You will get your answer after that. …
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