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# Forces

### Review of Forces

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

anything that can cause an object to change its motion (accelerate) | force |

law that says Force= mass times acceleration (F=ma) | Newton's 2nd law of motion |

when forces acting on an object are equal and opposite | balanced |

the sum of all forces acting on object | net |

F = Gm1m2/ d^2 | Universal gravitation equation |

force that always opposes motion | friction |

SI unit for force and weight | Newtons ( N ) |

SI unit for mass | kilograms ( kg ) |

SI units for acceleration | ( m/s^2 ) or ( m/s/s ) |

the tendency of an object to continue its motion (or stay at rest) | inertia |

type of friction that works on stationary objects (at rest) | static |

type of friction that works on moving objects (in motion) | kinetic |

the path of motion of any projectile | curved |

force that always causes a downward acceleration | gravity |

when only force acting on falling object is gravity | free fall |

mass times velocity | momentum (p) |

a falling object reaches this constant (max) speed when gravity and air resistance is equal | terminal velocity |

when 2 objects hit each other | collision |

this says that for every force there is an equal and opposite force | Newton's 3rd law of motion |

this says that an object in motion will stay in motion until acted on by a net force | Newton's 1st law of motion |

when object and its surrounding s are both in free fall | apparent weightlessness |

the amount of matter an object has | mass |

measure of gravity's pull on an objects matter | weight |

SI unit for momentum | kg * m/s |

quantity that is magnitude only | scalar (ex. speed, mass and weight) |

quantity that is both magnitude and direction | vector (ex. acceleration , velocity, momentum |