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Newton’s 3 rd Law of Motion. Newton’s 3 rd Law. For every action there is an equal and opposite reaction. Examples. Hammer and Nail:

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### Newton’s 3rdLaw of Motion

Newton’s 3rd Law

For every action there is an equal and opposite reaction

• Hammer and Nail:

• As a hammer hits a nail, the hammer applies a force to the nail AND the nail applies a force on the hammer this is why the hammer slows down as it hits the nail

• Rocket blasting off the launch pad:

• As the rocket applies a thrust force downward, the rocket moves upward

They are known as: “action-reaction pairs”

Object A applies an “action” force on Object B while at the same time Object B has a “reaction” force on Object A of equal magnitude but opposite direction.

That’s a lot to write out…

• It can be shortened with a formula! 

• FAB = -FBA

• In English this simply says the Force that Object A puts on Object B is equal but opposite (remember: the negative just means opposite direction) to the Force that Object B puts on Object A

• There is no action-reaction pair!

• You need the bending “action” to have the jumping “reaction”.

Think, pair, share (Think about it yourself, talk it over with a partner, and then write your ideas in your notes):

Use Newton’s 3rd Law of Motion to explain to a classmate why it hurts when you punch a wall.

YES! Well, in a way…

• The wall applies a force that is exactly equal in magnitude but opposite in direction.

• This “reaction” force is known as a negative force; remember the negative just refers to the fact that it is opposite in the direction it goes