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A full shipping crate sitting at rest on a warehouse floor experiences an upward normal force...

A full shipping crate sitting at rest on a warehouse floor experiences an upward normal force that is equal in size, but opposite in direction, to the downward gravitational force. Why are these forces NOT an example of Newton’s third law of motion? Explain.
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Answer #1

Answer :

First of all, let's understand what an action/reaction pair is : According to Newton's 3 law, action and reaction forces act on different bodies(strictly), have equal magnitude and act in opposite directions.

Consider A full shipping crate sitting at rest on a warehouse floor. Gravity (weight) is acting downwards on the crate as the Earth is trying to pull the book towards itself. Whereas Normal force is the force which the floor is applying on the crate.

Note that both the forces are acting on the crate whereas action and reaction forces act on different bodies.

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