Bouncing Impulse and The conservation of Momentum.
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Transcript of Bouncing Impulse and The conservation of Momentum.
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.
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.
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.
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.
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.
Conservation of Momentum
• Momentum, like velocity and force, has both direction and magnitude.
• Momentum is a vector quantity.
Conservation of Momentum
• The law of conservation of momentum states:
• In the absence of an external force, the momentum of a system remains unchanged.
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?