# Inertia And Momentum: Question Preview (ID: 8059)

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Why is Newton's first law correct even though real-world objects tend to eventually stop moving instead of remaining in motion? |
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a) Newton's first law does not apply in the real world. | b) Newton's first law does not take inertia into account. | c) Most objects are affected by unbalanced forces such as friction. | d) Newton's first law only applies to objects that are not already in motion. | |

Which of the following situations best illustrates Newton's first law? |
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a) Momentum= mass X velocity | b) Friction acts on objects in motion and at rest. | c) A lamp continues to sit at rest on a table if there is no net force on it. | d) When you push on a wall, the wall pushes back on you with an equal and opposite force. | |

Momentum is best defined as |
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a) mass divided by velocity. | b) velocity divided by mass | c) mass multiplied by velocity. | d) final velocity minus initial velocity divided by change in time. | |

Which of the following statements about momentum is always true? |
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a) Objects in motion do not have momentum. | b) Inertia and momentum are the same for all objects in motion. | c) As the velocity of an object increases its momentum increases. | d) As the mass of an object increases its momentum always increases. | |

A 0.25 kg ball is rolled across the floor with a velocity of 3.5 m/s. What is the ball's momentum? |
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a) 14 kg×m/s | b) 0.875 kg×m/s | c) 0.071 kg×m/s | d) 1.650 kg×m/s | |

The manufacturer of a bulletproof vest wants the vest to be able to stop a bullet with a mass of 0.4 kg and a velocity 1800 m/s. What is the momentum? |
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a) 720 kg×m/s | b) 740 kg×m/s | c) 820 kg×m/s | d) 4500 kg×m/s | |

A car is traveling with a velocity of 35.4 m/s. The mass of the car is 2000 kg. What is the momentum of the car? |
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a) 56.5 kg×m/s | b) 65.5 kg×m/s | c) 70,800 kg×m/s | d) 78,000 kg×m/s | |

A 0.145 kg baseball is thrown with a velocity of 40 m/s. What is the baseball's momentum? |
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a) 3.8 kg×m/s | b) 4.0 kg×m/s | c) 5.2 kg×m/s | d) 5.8 kg×m/s | |

Joan has a physics problem to solve. The mass is 50kg and the velocity is 2 m/s. Her answer is 10 kgxm/s. Is her answer correct? |
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a) Yes, it is correct. | b) No. her answer is ten times too small. | c) No, her answer is twice as big as it should be. | d) No, her answer is ten times bigger than it should be, | |

Esme's 0.28 kg ball rolls at 1.4 m/s. Danielle's ball has the same mass but a velocity of 2.3 m/s. Which ball has the most momentum? |
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a) Esme's ball | b) Danielle's ball | c) They are the same | d) Neither ball had the most momentum | |

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