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# Science Uit 1-3

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

Reference Point | a place or object used for comparison to determine if something is in motion |

Frame of Reference | is a set of coordinates that can be used to determine positions and velocities of objects in that frame; different frames of reference move relative to one another. |

Displacement | the direct, change in position of an object |

Speed | the distance an object travels per unit of time |

Velocity | The speed and direction of an object! |

Momentum | Product of an object’s mass and velocity |

Acceleration | the rate of change of velocity |

Force | a push or pull on something anything that changes something’s acceleration. |

Friction | anything that changes something’s acceleration. |

Weight | The gravitational force exerted on an object is the object’s weight |

Newtons First Law | An object moves at a constant velocity unless an unbalanced force acts upon it. |

Newtons Second Law | The motion of an object changes only if an unbalanced force acts on the object |

Newtons Third Law | When one object exerts a force on a second object, the second object exerts a force on the first that is equal in strength and opposite in direction. |

Work | force applied through a distance |

Efficiency | the ratio of output to input work. It is measured as a percent |

Mechanical Advantage | the ratio of output force to input force The effectiveness of a machine |

Energy | The ability to cause change! limits what can happen in any system |

Power | rate at which energy is converted |

Unit of Distance | Meters |

Unit of Time | Seconds |

Unit of Speed | meters/second |

Unit of Momentum | kg*m/s |

Unit of Acceleration | Meters/Second Squared |

Unit of Weight | Fg |

Unit of Force | Newtons |

Unit of Work | Joules |

Unit of KE/PE | Joules |

Unit of Efficiency | Percent |

Unit of Mechanical Advantage | N/A??? |

Unit of Power | Watts |

Unit of Calories | Joules 4000=1J |

Unit of Mass | kg |

Equation for Displacement | Direction+Direction, Direction-Direction, Pythagorean theorem |

Equation for Speed | Distance * Time |

Equation for Momentum | p=mv |

Equation for Force | F=ma |

Equation for Weight | W=mg |

Equation for Work | W=Fd |

Equation for Power | W p=----- t |