Physical Science Review Part 2

An object in motion tends to remain in motion

• because of a force within the object.

• only when an external force acts on it.

• without the need of a force.

• due to its nature.

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Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the rock tends at first to

• continue in a circular path.

• follow a straight-line path.

• spiral inward.

• fall straight downward.

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While a car travels around a circular track at constant speed, its

• acceleration is zero.

• velocity is zero.

• both of these

• none of the above

To steadily (constantly) increase the velocity of something requires a

• steadily increasing force.

• constant net force.

• decreasing force.

• none of the above

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If the mass of an object does not change, a constant net force on the object produces constant

• velocity.

• acceleration.

• both of these

• none of the above

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A given net force propels an object along a straight-line path. If the mass were doubled, its acceleration would

• quadruple.

• double.

• stay the same.

• be half.

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When an apple that weighs 1 N is held at rest above your head, the net force on the apple is

• 0 N.

• 0.1 N.

• 1 N.

• 10 N.

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A commercial jet has a mass of 5000 kg. During takeoff the thrust of its engine is 10,000 N, producing an acceleration of

• 0.5 m/s².

• 1 m/s².

• 2 m/s².

• 4 m/s².

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A car by itself is capable of a certain maximum acceleration. When it tows a car of the same mass, its maximum acceleration is

• half.

• one-third.

• one-fourth.

• the same.

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After a ball tossed upward leaves your hand, the force of gravity on it

• no longer acts.

• gradually diminishes.

• gradually increases.

• remains constant.