Newton’s 3rd Law.

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Presentation transcript:

Newton’s 3rd Law

Newton’s 3rd Law “For every action force there is an equal (in magnitude) and opposite (in direction) reaction force.” Any interaction involves two forces that we call action-reaction force pairs.

Examples: 1) You hit a baseball with a bat Examples: 1) You hit a baseball with a bat. The bat hits the ball - the ball hits the bat 2) A sprinter starts running. The sprinter pushes the ground - the ground pushes the sprinter 3) A fish swims through water. The fish pushes the water backwards - the water pushes the fish forwards

NEITHER!!! Bug hits truck – Truck hits bug Since, a = Fnet m Imagine a bug hitting the windshield of a semi trailer. What force pair occurs? Which force is bigger? Which object has a greater acceleration? Hands up if you hate Newton!!! Bug hits truck – Truck hits bug NEITHER!!! Since, a = Fnet m the truck has a much smaller acceleration because it is much, much more massive.

Some other common examples of Newton’s 3rd Law at work include: 1) When firing a gun, the gases push forward on the bullet AND backwards on the gun…

2) While breaking bricks you have to exert enough force to break them all… or else…

3) When a rocket lifts off, the gasses are pushed out of the back of the rocket, which means…