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# Work,Power,Waves

### This explains all about work power and waves.

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

What is a wave? | A wave can be described as a disturbance that travels through a medium from one location to another location. |

What is a medium? | A medium is the center of a wave. |

What is a transverse wave? | A wave in which the particles of the wave's medium move at right angles to the direction of wave movement. |

What is a crest? | A crest is the high point of a wave. |

What is a trough? | A trough is the low point of a wave. |

What does a longitudinal wave do? | A longitudinal wave is a wave that vibrates the same way it travels. |

What is compression? | Compression is a shock wave that compresses the medium through which it is transmitted. |

What is rarefaction? | The traveling or motion of a longitudinal wave. |

What is a mechanical wave? | A mechanical wave is a disturbance that pulsates through some form of medium: a solid, a liquid, or a gas, carrying the original, initiating energy from one place to another. |

What is an electromagnetic wave? | a wave produced by the acceleration of an electric charge by the periodic variation of intensities of, usually, perpendicular electric and magnetic fields. |

What is amplitude? | Amplitude is the measurement of how much energy is being carried out from a wave. |

What is wave length? | Wave length is the distance between crests. |

What is frequency? | How much a wave is repeated and weather is is close and fast or far and big. |

What is a hertz? | A hertz is a unit of frequency equal to one cycle per second |

What is wave speed? | Wave speed is a measure of how fast a wave travels. It is calculated as a ratio of how far a wave travels to the time it takes the wave to travel that distance. |

What is force? | A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. The unit of measurement is 'F'. |

What is work? | "work" is when a force applied to an object moves the object in the same direction as the force. The calculation for work is W times D w (work) d (distance) |

What is power? | Power is the rate at which work is done or energy is transferred in a unit of time. |

Calculate Work- A 100n force is applied to move a 15kg object a horizontal distance of 5 meters at constant speed | Answer- W=F times D = 100n (5m) = 500j/joules |

Calculate Force- An object of mass 300 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required to produce this acceleration. | F = m a F = (300 kg) (4 m / s2) F = 1200 kg m /s2 = 1200 N |

Knowing what you know, in order to complete Work what must there be / what must happen? | In order to accomplish work on an object there must be a force exerted on the object and it must move in the direction of the force. |

Knowing that work uses energy what would that energy be called? | That energy would be called power. |

How are force and power different? | Force is the fundamental result of an interaction between two objects, while power is an expression of energy consumed over time (work) |

Knowing that there is low frequency waves and high frequency waves, which produces smaller waves? | High frequency waves produce much smaller waves because it is traveling faster. |

Knowing that energy comes out of a wave what is the word used to measure how much energy is being exerted out of the wave? | The word for measuring how much energy comes out of a wave is called "Amplitude". |

Does changing the frequency of a wave affect its speed? Why or why not? | No, because as we increase the frequency, the wavelength decreases (and vice versa). |

Now you should be ready for a test | ;) |