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Cards In This Set
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What two things should you describe about a force that acts on an object?
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You should always describe the size and direction of a force.
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What instrument uses a spring to measure force?
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You would use a spring scale to measure force.
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Does a force act between two objects only when the objects are touching? Explain.
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Forces may act even when objects are not touching. For example, magnets attract or repel each other from a distance.
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If the force needed to lift a medium-sized grapefruit greater or less than one Newton? Explain.
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The force needed to lift a medium-sized grapefruit is greater than one Newton because one Newton is used to lift a small apple.
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How do balanced forces affect the motion of an object?
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Balanced forces cause no change in motion, even if the object is moving.
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When you are flying a kite, what forces act on the kite?
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Gravity, wind, and you are the forces acting on the kite.
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How do unbalanced forces affect a stationary object?
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Unbalanced forces cause a stationary object to move.
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What is an example of static friction on an object?
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-Pushing against a heavy piano.-Pushing a heavy box across the floor.
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In what direction does friction act on a moving object?
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Friction acts on a moving object in the opposite direction of the object's motion.
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Why don't you notice the gravitational pull of your school desk?
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You don't notice the gravitation pull of your school desk because the mass of the desk is too small compared to the mass of the Earth.
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How can you measure Earth's gravitational pull on an object?
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You would weigh the object.
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Would you weigh more or less on a planet with a gravitational force greater than that of Earth?
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You would weigh more.
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Why do most coastal areas have two high tides each day?
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One high tide is the result of the water being pulled away from the Earth. The other high tide is the result of the Earth pulling away from the water on the side away from the moon.
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Why would you expect Earth's gravitational pull on you high in the mountains to be different from the pull at a seashore?
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Because the gravitational pull would be slightly less because you are further away from Earth's center.
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Compare the gravity on Mars to the gravity on Earth.
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The gravity on Mars is about one-half the gravity on Earth.
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