# What happens with momentum in a game of pool?

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If a billiards ball is rolling around on the table, it has momentum. When the balls strike each other or the table walls, their velocity will change. A change in velocity can be from a change in speed, a change in direction, or both.

## Is momentum conserved in pool?

Pool is a great example of physics in action. After every collision, the momentum of all the balls—the product of their mass and velocity—has to be conserved. That is, the total momentum before the collision has to be the same as the total momentum after the collision.

## What happens to the momentum of the ball?

Since the initial momentum of the ball is zero while being at rest, the momentum being transferred will be equal to the final momentum of the ball. This change in momentum is the result of a force imparted by the club on the ball (2nd law) acting over a given duration of time.

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## What happens to all the momentum when two billiard balls collide?

When two billiard balls collide the collision is nearly elastic. An elastic collision is one in which the kinetic energy of the system is conserved before and after impact. … For collisions between balls, momentum is always conserved (just like in any other collision).

## Is momentum always conserved?

In collisions between two isolated objects Newton’s third law implies that momentum is always conserved. … Collisions in which the kinetic energy is also conserved, i.e. in which the kinetic energy just after the collision equals the kinetic energy just before the collision, are called elastic collision.

## How do you know if momentum is conserved?

Under what circumstances is momentum conserved? Momentum is conserved when the mass of the system of interest remains constant during the interaction in question and when no net external force acts on the system during the interaction.

## Is momentum conserved when a ball is dropped?

Momentum is conserved only for a closed system. … When a body drops from a height, it gains momentum down, while the earth gains the same momentum up. Since the earth is very massive, you can not observe its motion in reaction. Same goes for a ball rolling downhill.

## What is momentum a measure of?

Momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity; i.e., it has both magnitude and direction. Isaac Newton’s second law of motion states that the time rate of change of momentum is equal to the force acting on the particle.

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## Why do balls eventually stop bouncing?

If you drop the basketball, the force of gravity pulls it down, and as the ball falls, its potential energy is converted to kinetic energy. … This is because the basketball had an inelastic collision with the ground. After a few bounces, it stops bouncing completely.

## What has the greatest effect on an object’s momentum?

The momentum change is dependent upon the velocity change; the object with the greatest velocity change has the greatest momentum change.

## What would happen if two vehicles collide?

Without gravity, colliding cars would bounce off one another softly like beach balls. … With gravity, mass and acceleration combine to pack an enormous wallop.

## What change in momentum takes place when two billiard balls of equal mass but moving at different speeds collide head on?

Describe the changes in momentum that take place when two billiard balls of equal mass but moving at different speeds collide head-on. The magnitude of the slower ball increases and the magnitude of the faster ball decreases. Both balls change direction and the total momentum does not change.

## Does pool require physics?

Practice Playing Pool

Many great players make outstanding pool shots without knowing or consciously following any physics principles. Practice is what sets these great players apart from the good ones. … Therefore, even with physics knowledge, you’ll still need lots of practice to play billiards skillfully.

## Why does a billiard ball at rest move when hit by a moving billiard ball?

Before the collision, the stick is moving towards the ball at a high speed. After the collision, the stick stops moving. It transfers some of its kinetic energy to the cue ball, which rolls forward. But some of the kinetic energy is also lost to friction between the ball and the table, causing it to roll.

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## How does a billiard ball work?

Magnetic cue balls that go into a pocket are separated from numbered balls by a magnetic detector. As the magnetic ball passes this detector, the magnet triggers a deflecting device that separates the cue ball and, again, sends it into the opening on the side of the table.