# Module 5 PHYSICS: Question Preview (ID: 27722)

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A person is pushing on a 327-pound rock. What frictional force must he overcome to get the rock moving? (µs = 0.32, µk = 0.20) |
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a) 1025.5 N | b) 104.64 N | c) | d) | |

A tractor pulls a 225-kg bale of hay with a force of 4,233 Newtons. If the coefficients of friction are µs = 0.42 and µk = 0.30, how fast will the bale accelerate, provided that it is already moving? |
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a) .30 | b) 661.5 | c) 2205 | d) 15.87 | |

A mover pushes a 235-pound crate across a driveway (µs = 0.42, µk = 0.24). Assuming that the mover has already gotten the crate moving, how much force must the mover push with in order to keep the crate moving at a constant velocity? |
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a) 552.72 lbs | b) 56.4 lbs | c) .564 lbs | d) 55.27 lbs | |

If a rock has a mass of 55 grams on Mars, how much will it weigh on earth? |
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a) .539 N | b) 539 N | c) 5.39 N | d) | |

An object has a mass of 22 grams. What is its weight? |
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a) 215.6 N | b) 2.15 N | c) .216 N | d) | |

A rocket ship weighs 20,501 Newtons on Jupiter. How much will it weigh on earth? (The acceleration due to gravity on Jupiter is 23.2 m/sec2.) |
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a) 200,909 Newtons | b) 20.9 Newtons | c) 8,660.3 Newtons | d) | |

Assuming that there is no friction, how much force is necessary to accelerate a 235 gram object at 1.33 m/sec2? |
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a) 313 N | b) .3 N | c) 177 N | d) .2 N | |

3. You find a measurement of 22 kg written in a laboratory notebook. Is this a measurement of weight or mass? |
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a) weight | b) mass | c) | d) | |

6. For a given object and surface, is the coefficient of static friction (µs) greater than or less than the coefficient of kinetic friction (µk)? |
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a) Greater Than | b) Less than | c) | d) | |

3. You find a measurement of 20 Newtons written in a laboratory notebook. Is this a measurement of weight or mass? |
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a) weight | b) mass | c) | d) | |

2. A bicyclist is traveling at high speed and is not watching where he is going. His front tire catches in a sewer grating, causing the bike to stop almost instantly. This makes the rider fall off of the bike. Which way will the biker fall? |
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a) Foward over the bike | b) Backwards | c) To the left | d) To the right | |

What is Newton's 3rd law? |
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a) Every action has an equal and opposite reaction | b) F=ma | c) An object in motion (or at rest) tends to stay in motion (or at rest) unless acted uon by an outside force. | d) | |

What is Newton's first Law? |
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a) Every action has an equal and opposite reaction | b) F=ma | c) An object in motion (or at rest) tends to stay in motion (or at rest) unless acted uon by an outside force. | d) | |

What is Newton's 2nd law? |
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a) Every action has an equal and opposite reaction | b) F=ma | c) An object in motion (or at rest) tends to stay in motion (or at rest) unless acted uon by an outside force. | d) | |

While driving down a country road, a man has to stop because a 225-pound rock has fallen off of a hill and has landed in the middle of the road (μs = 0.45, μk=0.32). What is the frictional force the man must overcome to get the rock moving? |
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a) 101.25 lbs | b) 3240 lbs | c) | d) | |

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