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If you push an object twice as far while applying the same force, you do |
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twice as much work |
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A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of |
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power |
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If an object is raised twice as high, its potential energy will be |
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twice as much |
| |
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A ball rolling down an incline has its maximum kinetic energy at |
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the bottom |
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No work is done by gravity on a bowling ball that rolls along a bowling alley becauuse |
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the force on the ball is at right angles to the ball's motion |
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A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is |
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50% |
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A moving object has |
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speed, velocity, momentum, and energy |
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A feather and a coin dropped in a vacuum fall with equal |
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accelerations |
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Which moves faster in m/s on a merry-go-round: a horse on the inside or a horse on the outside near the rim? |
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outside horse |
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An industrial flywheel has a greater rotational inertia when most of its mass is |
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nearest the rim |
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A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the |
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coin |
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Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you'll multiply the torque by |
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two |
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When a twirling ice skater brings her arms inward, her rotational speed |
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increases |
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Consider a rotating donut-shaped space habitat where living quarters are on the inside surface farthest from the axis. If the rotational speed of the habitat increases, the apparent weight of people inside |
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increases |
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For a system in mechanical equilibrium the resultant forces and torques must |
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both be zero |
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According to Newton, the greater the masses of interacting objects, the |
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greater the gravitational force between them |
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According to Newton, doubling the distance between two interacting objects |
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divides by 4 the gravitational force between them |
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What is the force of gravity on a 500 N woman standing on the Earth's surface? |
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500 N |
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The earth's gravitational field extends |
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both inside and outside the earth and throughout the entire universe |
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Which is most responsible for the ocean tides? the moon or the sun? |
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the moon |
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According to Kepler's laws, the paths of planets about the sun are |
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ellipses |
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Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity |
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remains constant |
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An earth satellite is simply a projectile |
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freely falling around the earth |
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the fastest moving planet in a solar system is |
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the planet nearest hte sun |
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a "weightless" astronaut in an orbiting shuttle is |
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like the shuttle, pulled by earth's gravitation |
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