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# science

### motion,forces,,and simpple machines

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

what is average speed? | when you divide the distance traveled by the time it takes to travel the distance. |

whats is instantaneous speed? | the speed of an object at any instant of time. |

what is velocity? | the speed of an object and its direction of motion. |

what is acceleration? | the changge in velocity divided by the time needed for change to occur. |

what three ways can speed be described? | constant,instantaneous,average |

when does velocity change? | when the speed changes,the direction of motion changes. |

what is force? | a push or pull measured in nuetrons. |

what is newton's laws of motion? | a set of rules developed by Issac Newton to explain how forces affect the motion of an object. |

what is inertia? | tendency to resist a change in motion. |

what is friction? | force that resists slidinng motion between two touching surfaces;always acts opposite to the direction of motion. |

what is newton's 1st law? | an object will not change its mmotion unless an unbalanced force acts upon it |

what is newton's 2nd law? | if an object is acted upon by a force,the acceleration of the object will be in the direction of the force divided by the mass |

what is newton's 3rd law? | when one object exerts a force on a second object,the second object exerts anequal force iin the opposite direction on the first object. |

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