Momentum.

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Presentation transcript:

Momentum

Momentum is the product of mass and velocity. Definition Momentum is the product of mass and velocity. p = mv In the equation p is the momentum, m is the mass and v is the velocity.

Examples m V It is possible for both objects to have a lot of momentum. The top box has little mass but a lot of speed, which results in a large momentum. The bottom box has a lot of mass but little speed, which also results in a large momentum. Large objects moving fast have the highest momenta, while small objects moving slowly have the lowest momenta. M v

Vector Momentum is a vector quantity.

Conservation of Momentum The total momentum before a collision or an explosion is the same as the total momentum after a collision or an explosion as long as the net outside force is zero. This holds true for all collisions, regardless of type. Since the total momentum is the same before and after, momentum is said to be conserved (neither created nor destroyed).

A 10 kg mass moves right at a speed of 5 m/s A 10 kg mass moves right at a speed of 5 m/s. It collides inelastically with a 5 kg mass that is initially at rest. What is the speed of the masses after the collision?

Impulse is defined as the change in momentum

If the 2 kg ball approaches the wall at 5 m/s and rebounds at 4 m/s what is the impulse delivered by the wall to the ball? If the ball is in contact with the wall for 0.1 s what is the average force?