Question

1.What's the difference between velocity and speed?

A. Velocity has direction |

B. Speed is measured in m/s |

C. Speed is faster than velocity |

D. There is no difference |

2. Which of the following statements are true about impulse? (Select all that apply)

A. Objects involved in collisions encounter impulses |

B. The kg•m/s is equivalent to the units on impulse |

C. Impulse is a force |

D. The Newton is the unit for impulse |

E. In a collision, the net impulse experienced by an object is equal to its momentum change |

An object which is traveling east would experience a westward directed impulse in a collision |

Impulse is a vector quantity |

3. A force of 100 N acting for 0.1 seconds would provide an impulse of:

A. 5 N |

B. 100 N |

C. 1 N |

D. 10 N |

E. None of the above |

4. Which of the following statements are true about momentum? (Select all that apply)

A. The momentum of an object varies directly with the speed of the object |

B. An object which is moving at a constant speed has momentum |

C. A less massive object can never have more momentum than a more massive object |

D. The standard unit on momentum is the Joule |

An object with mass will have momentum |

E. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum |

F. Momentum is a vector quantity |

5. What happens to momentum if velocity is decreased?

A. It changes direction |

B. It continues the same |

C. It increases |

D. It decreases |

6. A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is:

A. Zero |

B. Unchanged |

C. Doubled |

D. Quadrupled |

Answer #1

1) A. Velocity has direction

2)

A. Objects involved in collisions encounter impulses

B. The kg•m/s is equivalent to the units on impulse

E. In a collision, the net impulse experienced by an object is equal to its momentum change

Impulse is a vector quantity

3) D

I = Ft = 100*0.1 = 10

4)

A. The momentum of an object varies directly with the speed of the object

B. An object which is moving at a constant speed has momentum

E. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum

F. Momentum is a vector quantity

5)

D

6)

C. Doubled

momentum p = mv So as the mass is doubled, p also doubles.

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