Newton’s 3 rd Law of Motion

1 / 13

# Newton’s 3 rd Law of Motion - PowerPoint PPT Presentation

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:

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about ' Newton’s 3 rd Law of Motion' - mahsa

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Newton’s 3rdLaw of Motion

Newton’s 3rd Law

For every action there is an equal and opposite reaction

Examples
• 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

ALL FORCES COME IN PAIRS

They are known as: “action-reaction pairs”

“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
Why is it so difficult?
• 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.

Can a wall really punch you back?

YES! Well, in a way…

How?
• 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