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# physics test 2

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

force perpendicular to the surface that prevents an object from entering the surface | normal force |

ratio between Fsmax and Fn | coeffecient of static friction |

ratio between Fk and Fn | coeffecient of kinetic friction |

2 objects rub off each other | force of friction |

chance in position of Xf - Xi | displacement |

displacement/time | average velocity |

change in velocity of over change in time | average acceleration |

the force between two surfaces that resists the initiation of sliding | static friction |

the force that opposes the movement of two surfaces that are sliding across each other | kinetic friction |

ratio of the magnitude of the force of friction and the normal force | coefficient of friction |

the maximum force exerted on an object before it begins to accelerate | Fsmax |

change in position | displacement |

displacement over change in time | velocity |

change in velocity over change in time | acceleration |

number is given to a power of ten and all numbers given are significant | scientific notation |

the degree of exactness of a measurement | precision |

describes how close a measurement is to the accepted value | accuracy |

the digits in a measurement that are known with certainty plus the first estimated digit | significant figures |

a quantity that has magnitude but no direction | scalar ex:speed |

a quantity that has both direction and magnitude | vector ex:acceleration |

describes the interactions between an object and its environment | force |

result from physical contact between two objects | contact forces |

doesnt involve physical contact between two objects | field forces |

the amount of force that when acting on one kilogram of mass produces an acceleration of 1m/s squared | Newton |

an object at rest remains at rest and an object in motion continues in motion with constant velocity | Newton's first Law |

the tendency of an object not to accelerate | inertia |

the vector sum of all forces acting on an object | Net Force |

a single force that acts on an object as a result of the interaction of object and its environment | external force |

objects that are at rest or moving with constant velocity | equilibrium |

part of a vector that is parallel to the x axis | x component |

part of a vector that is parallel to the y axis | y component |

the velocity of an object at a specific instant or point in the objects path | instantaneous velocity |