Circular Motion & Gravitation Review Activity

Two horses are attached to a rotating carnival merry-go-round, with the red horse at a shorter radius than the blue horse. Which of the following statements is true?

• The red horse has a greater period than the blue horse.

• The blue horse has a greater speed than the red horse.

• The blue horse has a greater period than the red horse.

• The red horse and the blue horse have equal speeds.

A merry-go-round at a carnival rotates at 6 revolutions per minute. What is the period of revolution?

• 6 rev/min

• 6 seconds

• 10 rev/sec

• 10 seconds

• 60 seconds

A ball on the end of a string is being swing in a VERTICAL circle as shown below. Points I, II, and III are labeled on the circle. If the string were to break at point II, which would be the initial direction in which the ball would move?

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Tags

NGSS.HS-PS2-1

The velocity and acceleration vectors associated with the motion of three particles are shown. Which of the above could represent the velocity and acceleration vectors for an object in uniform circular motion?

• I only

• II only

• III only

• I and II only

• II and III only

A child holds one end of a string and swings a ball on the other end of the string in a circular path with a constant speed of 3 m/s and a centripetal acceleration of 2 m/s². The length of the string is most nearly

• 0.2 m

• 0.7 m

• 1.5 m

• 3.0 m

• 4.5 m

Tags

NGSS.HS-PS2-1

A 40 kg child sits on the edge of a carnival ride at a radius of 6 meters from the center. The ride has a period of 2 s.

• 4 m/s

• 18.8 m/s

• 9.4 m/s

• 3 m/s

• 4.7 m/s

As the car goes around the curve, the centripetal force is directed

• toward the center of the circular curve

• away from the center of the circular curve

• tangent to the curve in the direction of motion

• tangent to the curve opposite the direction of motion

• The car is moving with constant speed, proving there is no force.

Tags

NGSS.HS-PS2-1

A ball on the end of a string is swung in a circle, rotating clockwise as shown. When the ball is at a particular point in the circle, the direction of the velocity, centripetal force, and centripetal acceleration vectors respectively are shown. Which of the following best represents the position of the ball as it rotates clockwise?

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Tags

NGSS.HS-PS2-1

A 40 kg child sits on the edge of a carnival ride at a radius of 6 meters from the center. The ride makes 2 revolutions in 4 seconds. The force which is holding the child on the ride is most nearly

• 300 N

• 1600 N

• 3200 N

• 2000 N

• 3000 N

Tags

NGSS.HS-PS2-1

Calculate the centripetal force acting on a 925 kg car as it rounds an unbanked curve with a radius of 75 m at a speed of 22 m/s.

• 2500 N

• 3269 N

• 5969 N

• 7408 N

Tags

NGSS.HS-PS2-1