Physics Ch 09 Circular Motion and Gravitation

For uniform circular motion, the acceleration

• Is parallel to the velocity.

• Is directed toward the center of the circle.

• Is always due to gravity.

• Is directed away from the center of the circle

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration?

• friction

• normal

• gravity

• tension

A passenger on a carnival ride rides in a car that spins in a

horizontal circle as shown (the view is from overhead). At the instant shown, which arrow gives the direction of the net force on one of the riders?

• A

• B

• C

• D

Answer explanation

The net force for an object moving in a circle is the centripetal force.

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A hollow tube lies flat on a table. A ball is shot through the tube. As the ball emerges from the other end, which path does it follow?

• A

• B

• C

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A ball at the end of a string is being swung in a horizontal circle. We know that the ball is accelerating because

• The speed is changing.

• The direction is changing.

• The speed and the direction are changing.

• The ball is not accelerating.

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A ball at the end of a string is being swung in a horizontal circle. What is the direction of the acceleration of the ball?

• Tangent to the circle, in the direction of the ball’s motion

• Toward the center of the circle

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A ball at the end of a string is being swung in a horizontal circle. What is the direction of the net force on the ball?

• Tangent to the circle

• Toward the center of the circle

• There is no net force.

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An ice hockey puck is tied by a string to a stake in the ice. The puck is then swung in a circle. What force is producing the centripetal acceleration of the puck?

• gravity

• air resistance

• friction

• normal force

• tension in the string

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A coin is rotating on a turntable; it rotates along with the turntable without sliding. At the instant shown in the figure, which arrow gives the direction of the coin’s velocity?

• A

• B

• C

• D

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A coin is resting on a rotating turntable; it doesn't slide but moves with the turntable. At the instant shown in the figure, which arrow gives the direction of the static friction force on the coin?

• A

• B

• C

• D

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NGSS.HS-PS2-1