Motion |
the change in position of one object in relation to the position of some fixed object/ |

Distance |
a measure of the total length along a path between two points. |

Displacement |
a measure of both length and the direction of an object’s path from its starting point straight to its ending point. |

Speed |
the rate at which an object changes position. |

Speed differ from Velocity |
Speed: the ratio of the distance an object moves to the amount of time the object moves Velocity: the speed and direction an object is moving, measured to a reference point |

Acceleration |
the rate of change in velocity. |

Two Examples of Acceleration |
Free falling, and a rocket launch |

Reference Point |
To identify an objects position, you must compare its location with that of another object or place. That other object or object is called.. |

Straight lines |
Distance between reference points and other locations can be measured in … |

It Has Experienced Motion |
When an object changes position over time, speed describes how quickly an object changes position. |

Speed= |
Distance/Time |

Distance-time graph |
A convenient way to show the motion of an object is by using a graph that plots the distance the object has traveled against time. This is called a… |

A change in Velocity |
a change in either speed or direction results in… Because velocity includes direction, it is possible for two objects to have the same speed but different velocities. |

What velocities include |
Speed and direction. To determine ________ of an object, you need to know both its speed and its direction. |

How acceleration is measured |
How quickly the velocity is changing. If velocity does not change there is no _____________. |

Acceleration= |
Final Velocities-Initial Velocity/Time |

Speed up or slow down |
The direction of the acceleration determines whether an object will…. |

Deceleration |
Negative acceleration is called ________. This means the object is slowing down. |

How Velocity-time graphs and distance-time graphs are related |
Both graphs are related because the distance an object travels depends on its velocity. |

Deceleration= |
Initial Velocity-Final Velocity/Time |

Velocity= |
Distance/Time in a given direction |

Velocity |
The speed and direction an object is moving, measure relative to a reference point |

Velocities in the same direction |
two objects moving the same direction |

velocities in opposite directions |
two objects moving opposite directions |

Relative Motion |
movement in relation to a frame of reference |

Vector |
a quantity that has a direction associated with it |

Resultant Vector |
the vector sum of two or more vectors |

Instantaneous Speed |
the rate at which an object is moving at a giving moment in time |

Average Speed |
the total distance traveled divided by the time it takes to travel that distance |

Constant Acceleration |
a steady change in velocity |

Linear Graph |
a graph in which the displayed data from a straight line |

Nonlinear Graph |
a graph in which the displayed data from a curved line |

Three Changes in acceleration |
change in speed, direction, and both |

The upright slope of a speed-time graph |
the point on the graph that represents acceleration |

The downward slope of speed-time graph |
the point on the graph that represents deceleration |

No movement |
A straight line on the graph represents.. |

# Chapter 11 Science- Motion

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