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# Physics 1 RemCh2

### review of chapter 2 vocab

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

speed | measure of how fast something is moving |

instantaneous speed | how fast something is moving at any given moment |

average speed | the distance covered divided by the time it took to cover it. |

velocity | speed in a given direction |

What is the average speed of a snail that travels 2 meters in 4 hours? | 0.5 m/h |

What is the velocity of a mountain goat that travels 200 m north in 10minutes? | 20 m/minute north (remember velocities need a direction) |

acceleration | the rate at which velocity changes |

A gerbil that starts at rest and accelerates to a velocity of 1 m/s right. It takes it 10 seconds to reach this velocity. What is its acceleration? | 0.1 m/s2 |

A rhino is traveling at a speed of 5 m/s. It travels for 10 seconds. How far does the rhino go? | 50m |

A wildebeest is traveling at a velocity of 2 m/s south. It travels 200 meters. How long does it take the wildebeest to cover the distance? | 100 s South |

A pumpkin starts at rest and is rolled down a ramp with an acceleration of 3 m/s2 down. If it accelerates for 2 seconds, how fast is it going? | 6 m/s down the ramp |

free fall | motion under the influence of gravity only |

air resistance | force that slows the acceleration of falling objects |

An unconscious turtle is dropped from the top of the high diving board. It takes 1.2 seconds to hit the water below. How fast was it moving when it hit | 11.77 m/s |

An unconscious turtle is dropped from the top of the high diving board. It takes 1.2 seconds to hit the water below. How far did it fall? | 7.06 m |

Does air resistance increase or decrease the acceleration of a falling object? | decrease |

How far will an object move in 1 second if its average speed is 4 m/s? | 4 m |

Sue Subaru travels in her car in a straight line at a constant speed of 30 miles per hour. What is Sue's acceleration? | a = 0 since she is not turning nor changing speed |

A dragster traveling at 10 m/s north increases its velocity to 25 m/s north in 3 seconds. What is its acceleration during this time period? | 5 m/s2 north |