phys111_sep09_lecture.pdf - Newtons Third Law A force and...

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Newton’s Third Law If you exert a force on a body, the body always exerts a force (the “reaction”) back upon you. A force and its reaction force have the same magnitude but opposite directions . These forces act on different bodies.
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A ball sits at rest on a horizontal table top. The gravitational force on the ball (its weight) is one half of an action–reaction pair. Which force is the other half? A. the force of the earth’s gravity on the ball B. the upward force that the table top exerts on the ball C. the upward force that the ball exerts on Earth D. the downward force that the ball exerts on the table top E. the frictional force between the ball and the table top A4.10 T Clicker Question 4.4
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A ball sits at rest on a horizontal table top. The gravitational force on the ball (its weight) is one half of an action–reaction pair. Which force is the other half? A. the force of the earth’s gravity on the ball B. the upward force that the table top exerts on the ball C. the upward force that the ball exerts on Earth D. the downward force that the ball exerts on the table top E. the frictional force between the ball and the table top A4.10 T Clicker Question 4.4
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A ball sits at rest on a horizontal table top. The weight of the ball is equal to the magnitude of the upward force that the table top exerts on the ball. Why? A. This is a consequence of Newton’s first law. B. This is a consequence of Newton’s third law. C. Because we assume that the table top is perfectly rigid.
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