Newton's Third Law

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This means:

* Action: The boy pushing forward on the crate with 100 Newtons of force.

* Reaction: The crate pushing back on the boy with 100 Newtons of force in the opposite direction.

Important Notes

* Equal and Opposite: The reaction force is equal in magnitude (100 Newtons) but opposite in direction (backward).

* Simultaneous: The action and reaction forces occur at the same time.

* On Different Objects: The action force is on the crate, and the reaction force is on the boy.

Why We Don't Always See the Reaction

We often don't see the reaction force as clearly because it's acting on a different object. In this case, the boy is much larger than the crate, so the force on him might not be noticeable.