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# forces vocabulary 1

### vocbulary

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

momentum | the product of an object's mass its velocity |

Formula for momentum | m=pv |

law of conservation of momentum | the total mo |

force | a push or a pull that gives energy to an object |

units of force | forces are measured in Newtons; N |

Net force | the total of all the forces acting on an object |

Inertia | the tendency of matter to resist a change in it's motion. |

Balance Force | the net force acting on an object is zero |

unbalanced forces | the net force acting on an object is not zero |

Magnitude | a force that one surface exerts on another when the two surfaces are in contact withe each other |

static friction | friction between non-moving objects |

kinetic friction | friction between moving objects |

sliding friction | friction between objects that slide (rub) against each other |

rolling friction | occurs when an object rolls over surface |

fluid friction | occurs when an object moves through a fluid or a gas |

Newton's First law of motion | objects at rest will stay at rest & objects in motion will stay in motion at a constant velocity unless acted on by an unbalanced force |

Newton's second law of motion | the net force acting on an objects is a equal to the product of the object's mass & acceleration |

Newtons third law of motion | for every action there is a reaction force that is equal, but acts in the opposite direction |

law of universal gravitation | all objects in the universe are attracted to each other; strength of attraction depends on the objects' masses and distances from each other |

Freefall | the the motion of an object when GRAVITY is the only force acting on it |

weight | a measure of the force of GRAVITY on an object |

mass | the amount of matter in something |

centripetal force | the force that is pulling an object in circular motion towards the center of the circle |

geosynchronous orbit | occurs when the an object orbits another object at a rate equal to the 2nd object's rate of ratation |