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# Acceleration

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

Acceleration is a vector quantity that represents the time-rate change in | velocity |

An airplane went from 100 m/s to 180 m/s in 2.0s. What was its acceleration? | 40 m/s/s |

If an object decreases its speed, then the vectors of velocity and acceleration __________. | Opposite directions |

If an object increases its speed, the the vectors of velocity and acceleration ____. | Same directions |

The initial speed of a bicycle at the top of a hill 3 m/s. The bicycle accelerates downhill at 1 m/s2 for 4.0 seconds. What is the bicyclist’s speed at the bottom of the hill? | 7 m/s |

What does the slope of a distance vs. time graph represent? | speed |

What does the slope of a velocity vs time graph represent? | acceleration |

What is the equation to find slope of a line? | (y2-y1)/ (x2-x1) |

What are the units for distance? | meters |

What are the units for time? | seconds |

what are the units for speed and velocity? | m/s |

What are the units for acceleration? | m/s/s |

What does the shape of an object speeding up look like on a distance vs time? | a curve that gets steeper |

What does the shape of an object slowing down look like on a distance time graph? | a curve that gets less steep |

What is the final velocity of a freely falling object 8 seconds after it is dropped? (g= -10m/s/s) | -80 m/s |

If you drop a bowling ball and coin at the same time in NASA's 8 story vacuum chamber (no air), which will hit the ground first? | they hit at the same time |

A ball is tossed straight up in the air. What is the speed of the ball when it's at its maximum height? | 0m/s |

A ball is tossed straight up in the air. What is the acceleration of the ball when it's at its maximum height? | -9.8 m/s/s |

During an experiment, an object is dropped from the sky and lands on earth but does not hit the earth at the calculated time. Why not? | Air resistance inhibits the motion |

When you drop an object, it accelerates downward because of ______________________. | gravity |

Gravitational attraction is lower on Mars than it is on Earth, therefore objects dropped on Mars would _______________. | fall at a slower rate |

A rock is thrown up with a velocity of 8 m/s. What is the rock’s velocity when it comes back down at the same height it was thrown? | -8m/s |

One characteristic of air resistance is ______________. | opposes motion |

How much velocity does a free falling object gain each second it falls down? | 9.8 m/s |