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# Energy Stack - Zoei

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

What is force? | A push or a pull exerted on an object in order to change the motion of an object (N) |

What is work? | The use of force to move an object some distance (J) W = F x D |

What is a wave? | Transport of energy without the transport of matter (light and sound waves are examples) |

What is a medium? | The material - solid,liquid, or gas - through which a wave can travel |

What is a crest? | The point where the wave is highest |

What is a trough? | The point where the wave is lowest |

What is a longitudinal wave? | Where particles move back and forth in the same direction that the wave travels |

What is compression? | The reduction in volume |

What is rarefaction? | Diminution in the density of something, especially air or gas |

What is a transverse wave? | Where particles move perpendicularly to the direction the wave travels |

What are mechanical waves? | Waves the require a medium |

What are electromagnetic waves? | Where waves are vibrations of electric and magnetic fields |

What is amplitude? | A measure of how far particles in the medium move from their rest position |

What is wavelength? | The distance from any point on a wave to the next identical point on the same wave |

What is frequency? | The number of waves that pass a point in a given amount of time, usually one second |

What are Hertz(Hz)? | One hertz is equal to one wavelength per second |

What is wave speed? | The speed that waves travel wave speed = frequency x wavelength |

What is power? | The rate at which work is done |

If a group of workers can apply a force of 2500 Newtons to move a crate 25 meters, what amount of work will they have accomplished? | W = F x D W = 2500 x 25 W = 62,500 J |

A set of pulleys lifts an 1000 N crate 6 meters in 10 seconds. What power was used? | W = F x D P = W / t W = 1000 x 6 P = 6000 / 10 W = 6000 J P = 600 watts |

A slinky was used to demonstrate how to calculate wave speed. The frequency was 5.3 m/s and the wavelength was 3 m/s, what is the wave speed? | The wave speed is 15.9 m/s |

A compression is comparable to a _____ ___________ in a transverse wave. A rarefaction is comparable to a ___ __________ in a transverse wave. | high frequency/low frequency |

The SI unit for work is... | force |

The SI unit for power is the... | watt |

If 470 Joules of work are needed to move a crate a distance of 6 meters, what is the weight of the crate? | F = W / D F = 470 / 6 F = 78.34 N |

How much time is needed to produce 680 Joules of work if 65 watts of power is used? | t = W / P t = 680 / 65 t = 10.46 sec. |

Created by:
zoei.tee.23