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# Forces & Motion

Term | Definition |
---|---|

Force | A push or pull that acts on an object. |

Inertia | The tendency of an object to move in a straight line. |

Gravity | An attraction between the mass of the Earth and the mass of the object. |

Weight | The force of gravity on an object. |

Friction | A force that opposes the motion of one object moving past another |

Newton's First Law of Motion | An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. |

Mass | The amount of matter in an object |

Balanced Forces | Forces that are equal and opposite and produce no change in the motion on an object. Unbalanced Forces – Forces that produce change in the motion of the object in the direction of the greatest force. |

Unbalanced Forces | Forces that produce change in the motion of the object in the direction of the greatest force. |

Acceleration | A change in velocity, or the objects position and speed. |

Velocity | The speed and direction of an object. |

Speed | The distance an object moves in a specific time. |

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

Newton's Third Law of Motion | For every action there is an equal and opposite reaction. |

Newton's Second Law of Motion | the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. |