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# 7Sci Chapter 18 Sec3

### Forces & Motion - Momentum

Question | Answer |
---|---|

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 |

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ndmsteach