Short Answer
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1.
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Start Page 13-17
A
tether ball is tied to a string and whirled in a horizontal circular path at a constant speed. What
causes the ball and string to move away from the post?
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2.
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What provides the centripetal force for the moon’s orbit around
Earth?
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3.
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Describe briefly how the moon causes tides on Earth.
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4.
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Discuss the following statement: “A satellite is continually in free
fall.”
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5.
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What is the significance of the word universal in Newton’s law
of universal gravitation?
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6.
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Compare the gravitational force the sun exerts on Earth to the gravitational
force Earth exerts on the sun.
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Earth exerts a 1.0 N gravitational force on an apple.
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7.
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Does the apple accelerate toward Earth, or does Earth accelerate toward the
apple? Explain your answer.
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8.
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What is the magnitude of the gravitational force the apple exerts on
Earth?
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9.
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What is Earth’s weight in the apple’s gravitational field?
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10.
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Briefly, how did Ptolemy describe the motion of the planets?
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11.
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Briefly, how did Copernicus describe the motion of the planets?
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12.
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What is Kepler’s first law of planetary motion?
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13.
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What is Kepler’s second law of planetary motion?
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14.
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State Kepler’s third law of planetary motion, both in words and
symbolically.
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15.
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What law does the diagram shown above illustrate?
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16.
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How did Newton use Kepler’s laws?
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17.
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On what variable factors do the period and speed of an object in circular orbit
depend?
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18.
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Are astronauts in orbit weightless? Explain your answer.
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19.
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How will an object move if it is acted on by a nonzero net torque and a net
force of zero?
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20.
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According to the sign conventions used in the text, in what direction will an
object rotate if the sign of the net torque on the object is negative?
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21.
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Identify the simple machine in the figure shown above.
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22.
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Identify the simple machine in the figure shown above.
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23.
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Identify the simple machine in the figure shown above.
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24.
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Identify the simple machine in the figure shown above.
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25.
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Identify the simple machine in the figure shown above.
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26.
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Explain how the operation of a simple machine alters the applied force and the
distance moved.
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27.
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How does the use of a machine alter the work done on the object?
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28.
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When a machine increases the force acting on an object, what happens to the
distance the object moves?
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29.
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When a machine decreases the force acting on an object, what happens to the
distance the object moves?
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