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Bouncing Impulse and The conservation of Momentum

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Bouncing Impulse When something bounces there is more impulse involved than if the object just falls and stops. This is due to the fact that when an object bounces it is essentially hitting an object and being thrust back in the opposite direction.

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Conservation of Momentum From Newton’s Laws of Motion we know that you need a force in order to make something accelerate. Similarly if you wish to change the momentum of an object, exert an impulse on it.

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Conservation of Momentum In order to exert an impulse on an object you must exert the impulse from an outside force In the picture to the right you can see the white ball exerts an impulse (a collision) which will give momentum to the yellow ball.

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Conservation of Momentum Just like in our lab with the balloon rockets, we must remember that for every action there is an equal but opposite reaction In the case with the cannon, the ball launched forward is equal but opposite to the recoil of the cannon.

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Conservation of Momentum In this scenario we have 0 momentum in the before image. In the after image we have 0 net momentum because the momentum of the ball going forward is equal but opposite to the momentum of the cannon’s recoil Net Momentum is the sum of all the momentum.

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Conservation of Momentum Momentum, like velocity and force, has both direction and magnitude. Momentum is a vector quantity.

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Conservation of Momentum The law of conservation of momentum states: In the absence of an external force, the momentum of a system remains unchanged.

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Try it! Newton’s second law states that if no net force is exerted on a system, no acceleration occurs. Does it follow that no change in momentum occurs?

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Try It Newton’s third law stats that the force of a cannon exerts on a cannon ball is equal but opposite tot he force the cannonball exerts on the cannon. Does it follow that the impulse the cannon exerts on the cannonball is equal and opposite to the impulse the cannonball exerts on the cannon?

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Bellringer You have learned that forces account for changes in the motion of objects. Using what you have learned, explain what happens in the following.

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