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# Physics - Chapter 8

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Question | Answer |
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_____ is the product of force exerted on an object and the distance though which the object is moved | Work |

What is the SI unit of work? | joule |

_____ is the rate at which work is done. | Powers |

What is the relationship between work and force? | directly proportional |

What is the relationship between work and distance? | directly proportional |

What is the relationship between power and time? | inversely proportional |

What is the relationship between work and power? | directly proportional |

____ is the property of an object or a system that enables it to do work. | Energy |

What is the SI unit of energy? | joule |

_____ is the energy due to the position of something or the movement of something. | mechanical energy |

What is the term for energy that is stored or held in readiness? It is often due to the position of the object. | potential energy |

____ is the type of energy that is calculated by using the formula mgh | gravitational potential energy |

_____ is the type of energy due to motion. | Kinetic |

To calculate kinetic energy, you multiple the mass by 0.5 then by the _____ squared. | velocity |

The Law of _________ says that energy can't be created nor destroyed be can be transformed from one type to another. | conservation of energy |

A(n) ____ is a device used to multiply forces or simply change the direction of forces. | machine |

Simple machine that is made of a bar that moves around a pivot point is called a ____> | lever |

A ____ is the pivot point of a lever. | fulcrum |

___ is the ratio of output force to input force for a machine. | mechanical advantage |

A ____ lever has the fulcrum between the load and the force. | type 1 |

A ____ lever has the load between the fulcrum and the force. | type 2 |

A ___ lever has the force applied between the fulcrum and the load. | type 2 |

A simple machine that is basically a lever that is used to change the direction of the force is called a___. | pully |

___ of any simple machine can be expressed as the ration of useful work output to total work input. | efficiency |

SI unit of power | watt |

The _____ can be concisely expressed as KE=PE=Work | Work-energy theorem |