Circular Motion Quiz Physics 12

A centripetal force ...

• is the force holding an object out as it swings on the end of a string

• is another natural force like gravity and magnetism

• has a component along the path of an object travelling at constant speed in a circle

• is a force applied perpendicular to an object, towards the centre of the circle, that causes the object to travel in a circle

Pilots bank their airplane when making a horizontal turn ...

• so that the horizontal component of the lift provides a centripetal force

• so that the vertical component of the lift provides a centripetal force

• to "show off" their skills

• to balance out the force of gravity

2. When you're whirling a ball on a string in a horizontal circle, what force keeps it moving in a circle?

(What force would you mark on a force diagram of the situation?)

• gravitational force

• centrifugal force

• tension force

• friction force

What is the centripetal force when the Moon travels around the Earth?

• There is no centripetal force, since there is no wire or rope connecting them

• No one knows for sure

• The gravitational force between the Earth and the Moon

• The centrifugal force

Spencer is practicing winter driving in the ESDH parking lot. Spencer turns the wheel to make a left-hand turn but his car continues in a straight line across the ice.

Teacher A and Teacher B had viewed the phenomenon.

Teacher A argues that the lack of a frictional force between the tires and the ice results in a balance of forces that keeps the car traveling in a straight line.

Teacher B argues that the ice placed an outward force on the tire to balance the turning force and thus keep the car traveling in a straight line.

• Teacher A is correct

• Teacher B is correct

• Neither is correct

• Both are correct

An object (see diagram) is moving in a clockwise direction around a circle at constant speed.

Which vector below represents the direction of the velocity vector when the object is located at point B on the circle?

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An object is moving in a clockwise direction around a circle at constant speed.

Which vector below represents the direction of the acceleration vector when the object is located at point C on the circle?

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An object is moving in a clockwise direction around a circle at constant speed.

Which vector below represents the direction of the force vector when the object is located at point A on the circle?

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