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# Waves, work power

### Waves, work and power

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

Wave | Vibration of a medium |

Medium | material through which a wave can travel |

Crest | the highest point in a wave |

Trough | Lowest point in a wave |

Transverse wave | When particles move perpendicularly to the direction the wave travels |

Longitudinal wave | Particles move back and forth |

Compression | When particles are pushed together |

Rarefaction | When particles are spread apart or separated from each other |

Mechanical waves | Waves that require a medium |

Electromagnetic waves | waves that can travel without a medium |

Amplitude | how far particles move from the rest position |

Wavelength | distance from any point on the wave to the next identical point |

Frequency | Time it takes for certain points in a wave to pass a specific points |

Hertz | One hertz equals one wavelength per second |

Wave speed | speed waves travel |

Force | the push or pull that moves and object |

Work | when an object has been pushed or pulled the same way as the force, work has been done on the object work = force x distance |

Power | How much time it takes to move an object work divided by time equals power |

If Dirk was climbing the stairs and it took him 30n of force to get up them and the stairs were 25 meters how much power did he use? | w = force x distance w = 30n x 25m W = 750 j |

If Dave was running down the halls and the halls were 10 m and he used 60 j to get down them and it took him 50 seconds how much power did he use? | w = f x d w = 60 n x 10 m w = 600 j Power = work divided by time P=600 divided 50 P= 14 w |

In a transverse wave the highest point in the wave is called the crest and the lowest point in the wave is called the trough what is like this in a longitudinal wave? | Compression and rare faction |

What is measured in joules? | Work is measured in joules work = joules |

What is measured in Watts? | Power is measured in watts power = watts |

What is measured in newtons ? | Force is measured in newtons force = newtons |

What do Hertz measure? | Hertz measure length in a wave per second |

If Mattchu is walking down the halls of the school ( cause as everyone knows you shouldn't run down the hallways) and he walks for 4 meters to his classroom and it takes him 60 seconds and he uses 30 j to get there how much power did he use? | Power equals work divided by time P = 60 divided by 30 P = 2 w |

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