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# Ch. 4 p.p. notes #2

### questions over powerpoint 2

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

What are the threethings that have to happen for acceleration to occur? | an increase in speed, a decrease in speed,and a change in direction. |

What is the equaation for acceleration? | final velocity(vf) minus initial velocity(vi)time interval(t) |

During each second of fall the instantaneous speed of th object increases by how much? | ten meters per second |

What is the instantaneous speed of an object falling from rest equal to? | the acceleration multipliedby the elapsed time. |

What is a straight line with constant acceleration at the average of the initial speed and the final speed? | the average speed of any moving object |

What is the first second of fall when the sum of the initial speed of zero and the final speed of 10 m/s are divided by 2 or 5 m/s? | The average speed of a freely falling object |

What increases and what remains the same for a freely falling object? | Velocity increases and Acceleration remains at a constant rate. |

What is the equation for calculating "How far?" | distance equals one half gravity times time squared. |

What can graphs do to describe the relationships such as velocity and acceleration? | They can visually describe the relationship. |

What kind of graph shows the speed on the vertical axis and the time on the horizontal axis? | A Speed versus time graph |

What is the slope of the graph? | the vertical change divided by the horizontal change. |

What are decreasing acceleration and constant speed called? | negative and zero acceleration |

What kind of graph shows the distance on the vertical axis and the time on the horizontal axis? | Distance versus time graph |

What is the result of this graph? | a curved line. |

What are two terms used to describe this graph? | parabolic and nonlinear relationship |

What do two objects depend on when they fall freely? | the air resistance around them. |

What is a certain elapsed time of either speed or velocity? | How fast something falls |

What is the question that goes with distance? | How Far the object has fallen. |