AP Physics Lesson 4 Quiz: Centripetal Force & Uniform Circular Motion

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1. A NASCAR race car is racing around a banked curve at a high speed Which vector represents the direction of the centripetal force?

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2. Using the diagram above, which vector represents the friction?

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3. A car going around a curve is found to be able to take the curve with maximumspeed “v.” You would like to double the maximum speed the car can take the curve.To do this, you could:

2 points

double the coefficient of friction between the car and the road

quadruple the coefficient of friction between the car and the road

halve the radius of the road

double the radius of the road

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4. A string with a bob attached swings in the vertical (see sketch). If it just barely makes it through the top of its arc, you know that:

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The velocity at the top will be zero.

The tension in the string at the top will be zero.

The centripetal force at the top will be zero.

The acceleration at the top will be zero.

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5. A mass attached to a string that is itself attached to the ceiling swings back and forth. If the bob is observed to bemoving upward at a given instance, as shown to the right, which arrow best depicts the direction of the net force acting on the bob at that instant?

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6. Which of the following statements is NOT true about centripetal forces:

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They are always oriented along the line between the body and the center of the arc upon which the body moves.

They are always perpendicular to the velocity vector.

They are always perpendicular to the acceleration component that motivates the body to change its speed.

They are one of the six naturally occurring forces used in conjunction with free body diagrams.

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7. A small sphere is swung in a vertical circle. Which of the followingcombinations represents the direction of the velocity and acceleration atthe bottom of the circle?

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8. In Earth's orbit around the sun, centripetal force is supplied by

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Electrical attraction

Universal gravitation

Inertia

Static friction

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9. True/False: When you turn a car quickly, the centrifugal force causes you to be thrust against the outside of the vehicle.

2 points

True

False

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10. Uniform circular motion indicates

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constant speed, changing velocity

constant speed, constant velocity

changing speed, changing velocity

changing speed, constant velocity

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