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# Chapter 10 Section 4

### Physics pgs. 353-359

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

momentum | The product of an object's mass and velocity |

Law of Conservation of Momentum | The rule that in the absence of outside forces the total momentum of objects that interact does not change. |

Why don't action and reaction forces cancel each other? | Action-reaction forces do not cancel each other because they act on different objects |

What must you know to determine an object's momentum? | The object's velocity and mass. |

What happens to the momentum of two objects after they collide? | In the absence of friction, the total momentum is equal to the total momentum before the collision. |

State Newton's third law of motion. | if one object exerts a force on another object, the second object exerts an equal and opposite force on the first object. |

According to Newton's third law of motion, how are action and reaction forces related? | Action and reaction forces are equal in strength and opposite in direction. |

What would happen if you tried to catch a ball when you were standing on roller skates? | When you caught the ball, you (with the ball in your hand)would move in the direction of the ball's initial motion. |

What is momentum? | Momentum is a characteristic of an object equal to the product of its mass and its velocity. |

What is the momentum of a parked car? | Because the velocity of a parked car is zero, its momentum is zero. |

Why is it important for drivers to allow more distance between their cars when they travel at faster speeds? | cars traveling at faster speeds have more momentum and are more difficult to stop than cars traveling at slower speeds. |

what is conservation of momentum? | Disregarding friction, the quantity of momentum is the same before and after objects interact. |

The total momentum of two marbles before a collision is 0.06 kg m/s. No outside forces act on the marbles. What is the total momentum of the marbles after the collision? | The total momentum stays the same; 0.06 kg m/s. |

Created by:
Tom Radeke