# Physics Circular Motion And Gravity Test: Question Preview (ID: 22064)

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A fly riding on the blade of a fan spinning at a constant speed is not accelerating |
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a) True | b) False | c) | d) | |

The acceleration of an object in uniform circular motion always points toward the center of the circle. |
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a) True | b) False | c) | d) | |

Centrifugal force is a center-seeking acceleration |
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a) True | b) False | c) | d) | |

When an object moves in a circle at a constant speed, the net force toward the center of the circle is the centripetal force. |
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a) True | b) False | c) | d) | |

The outside edge of a spinning compact disc is moving at a higher velocity than an inside track on the disc |
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a) True | b) False | c) | d) | |

Ellipses have only one focus |
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a) True | b) False | c) | d) | |

Gravity is a contact force. |
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a) True | b) False | c) | d) | |

When an object is moving with uniform circular motion, the object's tangential speed |
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a) is circular | b) is perpendicular to the plane of motion | c) is constant | d) is directed toward the center of motion | |

The centripetal force on an object in circular motion is |
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a) in the same direction as the tangential speed | b) in the direction opposite the tangential speed | c) in the same direction as the centripetal acceleration | d) in the direction opposite the centripetal acceleration | |

A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line? |
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a) centripetal acceleration | b) centripetal force | c) centrifugal force | d) inertia | |

When calculating the gravitational force between two extended bodies, you should measure the distance |
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a) from the closest points on each body | b) from the most distant points on each body | c) from the center of each body | d) from the center of one body to the closest point on the other body | |

Newton's law of universal gravitation |
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a) can be derived from Kepler's law of planetary motion | b) can be used to derive Kepler's third law of planetary motion | c) can be used to disprove Kepler's law of planetary motion | d) does not apply to Kepler's laws of planetary motion | |

The gravitational force between two masses is 36 N. What is the gravitational force if the distance between them is tripled? |
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a) 4.0 N | b) 9.0 N | c) 18 N | d) 27 N | |

When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car? |
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a) centripetal acceleration | b) centripetal force | c) centrifugal force | d) inertia | |

Two small masses that are 10.0 cm apart attract each other with a force of 10.0 N. When they are 5.0 cm apart, these masses will attract each other with what force? |
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a) 5.0 N | b) 2.5 N | c) 20.0 N | d) 40.0 N | |

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