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# AP Physics 1

### Vocabulary Chapter 2

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

Displacement | A vector quantity that represents the length and direction of a straight line path from one point to another. > The magnitude of displacement is distance. |

Kinematics | The area of physics that deals with the mathematical methods of describing motion without regard to the forces which produce it. |

Acceleration | A vector quantity that represents the time-rate of change in the velocity of an object: a= ΔV/t. > The SI unit of acceleration is meters per second squared: m/s^2. |

Acceleration Due to Gravity | Commonly denoted by the symbol g; it is the same for all objects on Earth, regardless of their mass. >Near the surface of the Earth, the magnitude of g is 9.8 m/s^2. |

Average Speed | The average of the initial and final speeds of an object: Vav= vf + vi /2. >Speed is the magnitude of the velocity vector. |

Average Velocity | The average velocity of a uniformly accelerated object may be found by averaging its initial and final velocities. v= vi + vf / s . >Velocity is a vector quantity. |

Change in Velocity | Any change in the speed or direction of an object's motion; acceleration. |

Constant Velocity | Uniform unchanging velocity. |

Distance | A scalar quantity that represents the length of a path from one point to another; the magnitude of the displacement vector. |

Final Speed | The speed (magnitude of velocity) that an object ends with. |

Initial Speed | The beginning or starting speed (magnitude of velocity) of an object before there is any change in its speed. |

Initial Velocity | The beginning or starting velocity of an object before there is any change in its velocity (acceleration or deceleration.) |

Speed | A scalar quantity that represents the magnitude of velocity. It is the time-rate of change in distance: v=d/t. |

Velocity | A vector quantity which represents the time-rate of change in the displacement of an object: v=d/t. |

Final Velocity | The velocity that the object ends with after a change in its initial velocity is made. |

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BMcCormack