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# Unit 9/chapter 2

### Unit 9/chapter 2 study guide

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

If u walk 2 miles from your house and back, what is your a) distance traveled and b) displacement? | A. 4 miles B. 9 miles |

Motion is defined as a change in | Position |

Which if these is a velocity: 5 m/s or 5 m/s north? why? | 5 m/s north because velocity includes direction. |

A single point on a distance-time graph tells you an object's | Instantaneous speed |

Acceleration | Is the rate of change of velocity over time. |

Inertia varies depending on an object's | Mass |

Newton's first law of motion is also called the law of | Inertia |

The distance traveled by an object divided by the time it takes to travel that distance is called | Average speed |

The speed of an object at rest is | Zero |

The difference between speed and velocity is velocity includes | Direction |

The SI unit for acceleration is | M/s 2 |

The combination of all the forces acting on an object is called the | Net force |

If the net force acting on a stationary object is zero, the object will | Remain at rest |

An object is in motion when the object changes | Position in relative to a stationary reference point |

In a car crash | Inertia could cause you to crash into the windshield. |

When an object speeds up, it's acceleration is | Positive; when an object slows down, it's acceleration is negative. |

A= | Acceleration |

Vf= | Final velocity |

Vi= | Initial velocity |

Tf= | Final time |

D= | Distance |

V= | Velocity |

T= | Time |

The faster an object is moving, the | Steeper the slope on a distance-time graph. |