Question

# A 35-kg crate rests on a horizontal floor, and a 65-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.

Solution

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$\textbf{Concept: }$

As we know the core of classical mechanics is Newton's three laws of motion which the basic classical laws describing motion. As we know the Newton's first law assigns that if the net force on an object s zero, an object originally at rest remains at rest, and an object in motion remains in motion in a straight line with constant velocity.

Also, we know that Newton's second law assigns that the acceleration of an object is directly proportional to the net force acting on it, and inversely proportional to its mass

\begin{align*} \sum F &= m ~ a \end{align*}

As we know Newton's third law assigns that whenever one object exerts a force on a second object, the second object always exerts a force on the first object which is equal in magnitude but opposite in direction

\begin{align*} F_{AB} &= - F_{BA} \end{align*}

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