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Newton's Third Law of Motion

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Third Law - to every action force, there is an equal and opposite reaction *when you jump on a trampoline, you exert a downward force while the trampoline exerts and upward force What will happen if one of the passengers jumps out of the boat? We made a video like this in class. Watch it!Watch it!

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Rocket Propulsion If you throw a ball, the ball exerts a force on you, pushing you in the opposite direction. The ball doesn't have enough force to be noticeable to you, however some things are very noticeable...like the "kick" on a shotgun. Hot gases moving out of the rocket push the rocket away from the earth.

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Video on Propulsion What are the four forces acting on the jet?

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You can create something similar to a jet using a straw and a balloon. A. Attach balloon to the straw with masking tape B. Attach a second straw vertical to the first one using a pin. C. Blow up the balloon and then release it. 1. What happens to the straw as the air goes out of the balloon? ______________________________________________________ ___ 2. If you bend the straw to the right, the straw spins which direction? ______ 3. If you bend the straw to the left, the straw spins which direction? _______ 4. What can you do to SLOW the spin of the straw? _________________

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Balloon Car You can build a balloon car with index cards, straws and other assorted objects. Which of the following would make it go faster? (check) ___ Bigger wheels ___ Bigger balloon ___ Bigger straw ___ Bigger body ___ Raise balloon higher When air is released from the balloon, which direction does the car travel?

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MOMENTUM = mass x velocity p = mv Momentum describes how much force is necessary to change its motion Which has more momentum: soccer ball traveling at 5 m/s or a train traveling at 5 m/s

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p = mv 1. What is the momentum of a car with a mass of 1000 kg traveling at the speed of 2 m/s? 2. A baseball has a momentum of 6 kg*m/s. If the mass of the baseball is 3 kg, what is the baseball's velocity? 3. What is the mass of a person walking at a speed of 2 m/s if the person's momentum is 50 kg*m/s

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Law of Conservation of Momentum states that the total momentum of an isolated system before collision is always equal to total momentum after collision *If you hit a pool ball into another pool ball, momentum is transferred and *conserved*. The cue ball stops but the other ball moves.

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Practice Set: Momentum p = mv Law of Conservation of Momentum m1v1 = m2v2 1. A 4 kg metal ball moves at a speed of 5 m/s strikes a larger ball that is at rest. After the collision, the larger ball moves at a speed of 2 m/s. What is the larger ball’s mass? 2. A 4 kg metal ball moves at a speed of 5 m/s strikes a larger ball that is at rest. The larger ball has a mass of 10 kg. What will its speed be after the collision?

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How is each of these demonstrated in the video? 1. Newtons 1st Law _________________________ 2. Newtons 2nd Law _________________________ 3. Newtons 3rd Law _________________________

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Objects in motion tend to _________ in motion. Force equals ___________ x acceleration Where would you need to hit the cue ball?

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COLLISIONS Elastic vs inelastic Elastic - objects bounce off each other Inelastic - objects stick together Conservation of Momentum still applies. Experiments with the airtrack.airtrack

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QUIZ TIME - Newton's 3rd Law

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1. When looking at the forces on a jet, what force counteracts gravity? 2. Newton's Third Law states that for every action there is an opposite __________________ 3. If you jump off the back of a boat, the boat will move in which direction? 4. What is the equation for momentum? 5. Momentum describes how much force is necessary to ________________________

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6. The Law of ____________________ of momentum states that the total momentum of an isolated system before collision is always equal to total momentum after collision 7. Which of the following situations best illustrates this Law? a) a large ball is used to knock a smaller ball off a table b) a cannonball is launched from a cannon c) a rocket is propelled upward when the engine fires 8. Which has more momentum? a) 5 kg toy car traveling at 3 m/s b) 5 kg toy traveling at 6 m/s 9. In an elastic collision, objects will _____________ 10. Who developed the Laws of Motion? ___________

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Momentum is conserved for all collisions as long as external forces don’t interfere.

Momentum is conserved for all collisions as long as external forces don’t interfere.

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