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# McC 8 Physics

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

Motion | change in position |

Force | a push or pull with a size and direction |

Acceleration | when an object speeds up, slows down, or turns. |

Inertia | measures the tendency of an object to remain at rest or keep moving. |

Newton's 1st Law | object remains at rest or moves in a straight line with constant speed unless a force acts on it |

Newton's 2nd Law | an object acted on by an unbalanced force will accelerate in the direction on the force |

Newton's 3rd Law | forces always act in equal but opposite pairs |

Balanced Forces | forces are equal but in opposite directions, canceling each other out |

Unbalanced Forces | When one force is greater than another, a change in motion (acceleration) will result. |

Weight | the force of gravity on an object; weight = mass X 9.8 m/s2 (acceleration due to gravity) |

Acceleration due to gravity | 9.8 m/s2 |

Contact Forces | involves objects touching each other |

Long Range or Non Contact Forces | forces that occur at a distance (grvity, magnetism, electricity) |

Distance | entire path an object travels |

Displacement | distance and direction between starting and stopping positions |

Speed | distance traveled divided by the time needed to travel the distance or s = d/t |

Relative Motion | an object's position change as described in terms of a reference point |

Constant Speed | speed is the same at any given moment in time |

Instantaneous Speed | speed at a particular instant in time |

Friction | a force that resists motion |

Velocity | displacement over a given time. (Speed with direction)per unit of time. |

Mass | how much matter is in an object |

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