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**Newton’s Third Law of Motion**

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**Newton’s Third Law of Motion**

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object

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**Newton’s Third Law of Motion**

For every action, there is an equal and opposite reaction

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**Newton’s Third Law of Motion**

Newton’s third law states that for every action force there has to be a reaction force that is equal in strength and opposite in direction.

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**Newton’s Third Law of Motion**

One force is called the action force The other force is called the reaction force

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**Newton’s Third Law of Motion**

The action and reaction forces are equal in strength and opposite in direction

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**Newton’s Third Law of Motion**

Forces always come in pairs All forces come in pairs. When you push on the ground (action), the reaction of the ground pushing back on your foot. It does not matter which force you call the action or the reaction. The action and reaction forces are interchangeable.

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**Newton’s Third Law of Motion**

DISCUSSION Does a stick of dynamite contain force?

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**Newton’s Third Law of Motion**

DISCUSSION No. Force is not something an object has, it is an interaction between one object an another

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**Newton’s Third Law of Motion**

DISCUSSION A car accelerates along a road. Strictly speaking, what is the force that moves the car?

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**Newton’s Third Law of Motion**

DISCUSSION The road pushes the car along! The rotating tires push back on the road (action) and at the same time the road pushes forward on the tires (reaction)

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**Newton’s Third Law of Motion**

Discussion: When a cannonball is shot out of a cannon, the force exerted against the cannon is the same force that drives the cannonball. Why then does the cannonball undergo more acceleration?

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**Newton’s Third Law of Motion**

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**Newton’s Third Law of Motion**

How does the space shuttle get into space?

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**Newton’s Third Law of Motion**

The shuttle's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.

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**Newton’s Third Law of Motion**

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**Newton’s Third Law of Motion**

An astronaut can move in space by throwing an object in the direction opposite where the astronaut wants to go.

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**Newton’s Third Law of Motion**

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**Newton’s Third Law of Motion**

While driving down the road, a firefly strikes the windshield of a bus and SPLAT! This is a clear case of Newton's third law of motion. The firefly hit the bus and the bus hits the firefly. Which of the two forces is greater: the force on the firefly or the force on the bus?

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