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# 7Sci Chapter 18 Sec3

### Forces & Motion - Momentum

What is momentum? quantity defined as the product of the mass and velocity of an object
What happens to momentum when two billiard balls collide? it stays the same
What is momentum conservation? the law that states that any time objectscollide, the total amount of momentum stays the same
What gives momentum to a ball at rest? reaction force
What reduces momentum of a cue ball? action force
What happens to a train's momentum when it increases its velocity? it increases
An ice skater with a mass of 65 kg moves along the ice with a constant velocity of 2.0 m/s. What is the skater's momentum? 130 kg  m/s
An astronaut uses a jet of nitrogen of gravity to maneuver in space. How can this be done? momentum conservation
What must you know to find momentum of an object? mass and velocity
Which one of Newton's law of motion is equivalent to the law of conservation of momentum? the third
What is the equation for momentum? p = m x v
Created by: ndmsteach