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# Newton's 3rd Law

Action and reaction forces
by

## Ana Carolina Feinstein Ribeiro

on 19 September 2012

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#### Transcript of Newton's 3rd Law

Carolina Feinstein, Rebecca Cruz,
Raphaela Barreto and Alessandra Oliva Newton's Third Law Newton's 3rd Law Action and Reaction Action-Reaction pairs Newton’s Third Law => for every action there is an equal and opposite reaction.

According to Newton, whenever objects A and B interact with each other, they exert forces upon each other.

Examples:

• When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body.

• An example of an action reaction pair is the propulsion of a fish through the water. It uses its fins to push water backwards and it accelerates the water. Action Force-the action force is the force which acts on the body due to some external effort.

Reaction force- A reaction force is basically a force that acts in the opposite direction to an action force. It can better be described as when one fires a bullet from a gun, they feel being pushed backward. The action force in this case is the gun pushing out the bullet and the reaction is the bullet pushing back on the gun and its holder. Action Force is a force that exerts a force on another object. It often comes in pairs with the Reaction Force, forming an action-reaction pairs. Examples If you push on a wall you feel a force against your hand the wall is pushing back on you with as much force as you apply to it. If this wasn't happening, your hand would accelerate through the wall. Standing on the ground, you push on the ground with a force due to gravity and the ground pushes back on you.The term "normal" means anything at a right angle in math or the sciences. FN is the normal force. It balances out the force due to gravity down. The normal force is always perpendicular to the surface the object is on. Without it there would be a net force down on you and you would accelerate down. This is an example of an action-reaction pair, two forces that are equal but opposite to each other. * All forces exists in pairs, if object A exerts a force on object B, then

B simultaneously exerts a force on A;

* Newton's third law is also known as action-reaction law;

* For every action, there is an equal and opposite reaction. Forces always come in pairs known as "action-reaction force pairs." Identifying and describing action-reaction force is like identifying the two interacting objects and making two statements describing who is pushing what and in what direction.
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