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# Motion and Force-1

### Motion and Force

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

Distance | How far an object has moved. Measured in SI units---meters, kilometers, and centimeters |

Displacement | The distance AND direction of an object's change in position from the starting point. Ex. 20 meters North |

Motion | A change in position |

Speed | The distance an object travels per unit of time. Formula speed=distance traveled/time |

Velocity | the speed of an object and it's motion **A change in velocity can be either a change in how fast something is moving or a change in the direction it is moving Formula change in velocity =final velocity - initial velocity |

Acceleration | the rate of change of velocity (acceleration also has a direction) **occurs when an object changes its speed, its direction, or both Formula a=v(f)-v(i)/t Acceleration can be positive + OR negative - |

Force | A push or pull |

Net force | when two or more forces combined act on an object at the same time |

Balanced Forces | when two or more forces act on an object and cancel each other out (a net force of zero) |

Unbalanced Forces | unequal forces acting on an object in opposite directions |

Inertia | the tendency of an object to resist any change in its motion. |

Newton's First Law of Motion | If an object is moving at a constant velocity, it keeps moving at a constant velocity unless an unbalanced force acts on it. And if an object is at rest, it stays at rest unless an unbalanced net force acts on it. |

Average speed | the total distance traveled divided by the total time of travel s=d/t |

Instantaneous Speed | the speed at a given point in time Ex. the speed shown on the speedometer of a car |

Constant speed | If an object neither slows down nor speeds up **Usually speed is not constant*** |

Created by:
akley