Ap Physics Circular Motion and Gravitation

Calculate the mass of an object if it took 20 N of force to rotate it in a circle with a radius of 2 meters with a velocity of 4 m/s

• 4.1 kg
• 3.6 kg
• 2.5 kg
• 1.8 kg

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NGSS.MS-PS2-2

Why do objects experience centripetal acceleration?

• Because they are speeding up as they move in a circle
• Because they are constantly changing direction and the net change is directed inward
• Because they are constantly changing both speed and direction
• Because when you have 100 people pedaling, you can speed up more easily.

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NGSS.MS-PS2-2

At the instant shown in the diagram, the car's centripetal acceleration is directed-

• toward E

• toward N

• toward W

• clockwise

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NGSS.HS-PS2-1

A pilot experiences centripetal acceleration of 2g's while maneuvering a loop at a speed of 400 m/s.  What is the radius of the loop?

• 203 m
• 8163 m
• 80,003 m
• 23 m

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

The velocity is always _____ to the line of a circle. 

• outwards
• towards the center
• tangent
• faster

If the radius of the string is .3 meters long and the stopper makes 5 revolutions per second, what is the speed of the stopper? (Hint: C=2πr)

• 9.4 m/s
• 6.8 m/s
• 11.7 m/s
• 3.5 m/s

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NGSS.MS-PS3-1

The drum of a washing machine rotates 600 times in 1 minute. What is the frequency of the drum?

• 600 Hz

• 10 Hz

• 0.1 Hz

• 0.002 Hz

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NGSS.MS-PS4-1

What happens to an object's speed as the radius decreases?

• It increases.
• It decreases.
• It remains unchanged.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

If a ball is swinging at the end of a rope and the rope is suddenly cut, assuming there is no gravity, what best describes the path it will take?

• It will fly in a straight line forward from where it was cut

• It will fly in a curved line away from the circle

• It will fly inward toward the circle

• 

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A toy train moves in a circular track with a velocity of 2.2 m/s, the axis of rotation is 1.8 m. What is its centripetal acceleration?

• 1.22 m/s²

• 0.81 m/s²

• 2.69 m/s²

• 1.47 m/s²