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# Physics

### Chapter 8-9

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

What is the study of motion called? | Kinematics |

What is a scalar? | A scalar describes the 'size' of a measurement. (not the direction) |

What is the term used to describe the magnitude/size and direction? | Vector |

-Bob runs 8m/s- This is an example of a scalar or a vector? | Scalar |

-Zoe runs 300m east- This is an example of a scalar or a vector? | Vector |

What is the term to describe the length between 2 points is? | Distance (scalar) |

What is the term to describe a specific point with respect to a reference point? | Position (vector) |

What is displacement? | This is how far the final position is from the initial position. (vector) ex) Rob ran a 200m relay around the track. - Distance = 200m - Displacement = 0m |

-Fill in the blank- When calculating direction we use negative and positive numbers. Right, up forward, north, and east are all examples the number would be _________. | Positive |

-Fill in the blank- When calculating direction we use negative and positive numbers. Left, down backward, south, and west are all signs the number would be __________. | Negative |

Time is how long it takes an event to occur. What is this measured in? | Seconds (scalar) |

What is uniform motion? | When an object moves at a constant speed in a straight line. |

What is the term to describe the distance traveled divided by the time taken to travel? | Speed ex) 80 km/h or 11m/s |

What is the term to describe the displacement traveled divided by the time taken? | Velocity |

What is the term to describe the point when 2 lines that cross over? | Intercept |

How do you calculate slope? | M= Rise/Run -> on a position time graph this is used to find velocity |

How do you convert 97.3km/h to m/s? | 97.3 km/h / 3.6 = 27.02 m/s |

How do you convert 43.8 m/s to km/h? | 43.8m/s x 3.6 = 157.68 km/h |

What is the term to describe the rate at which velocity changes? | Acceleration (vector) -WOOT WOOT, Chapter 9!- |

Acceleration depends on 2 variables what are they? | 1. Time it takes to speed up or slowdown 2. How much the velocity changes |

Is it possible to have a negative acceleration? | Yes. |

2 ways of calculating Acceleration, one is given to you on your cheat sheet, what is the other way? | The slope of a v/t graph |

-Fill in the blank- ________ is whenever gravity is the only force on a object. | Freefall |

In freefall ALL objects accelerate at what rate? | -9.80m/s 2 or 9.80m/s (down) - Gravity is always downward this means is always negative |