M6 L2 Circular Motion (Physics)

What force causes an object to move in a circle?

• gravitational force

• centripetal force

• frictional force

• tension force

Which describes the velocity of an object in uniform circular motion?

• It changes magnitude and is always tangent to the circle.

• It constantly changes magnitude and direction.

• It changes direction and is always tangent to the circle.

• It changes magnitude and is always toward the center of the circle.

Which describes an object in uniform circular motion?

• It accelerates because its velocity is toward the center of a circle.

• It does not accelerate because the force acting on it constantly changes magnitude.

• It accelerates because it constantly changes direction.

• It does not accelerate because it travels at a constant speed.

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NGSS.HS-PS2-1

Jay is on a fishing trip and decides to swing a 0.028-kg fishing-line weight around on the end of a 0.75-m piece of fishing line. The weight makes one revolution in 1.2 s. What is the magnitude of the force exerted by the string on the weight?

• 0.15 N

• 0.41 N

• 0.58 N

• 0.73 N

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NGSS.HS-PS2-1

Which describes centrifugal “force”?

• It exists and acts toward the center.

• It exists and acts away from the center.

• It is fictitious even though there is an agent.

• It is fictitious because there is no agent.

Which describes the centripetal acceleration of an object in uniform circular motion?

• It constantly changes direction but always points away from the center.

• It constantly changes direction but always points tangent to the circle.

• It constantly changes direction but always points toward the center.

• It constantly changes magnitude but always points tangent to the circle.

A 12.0 g rubber ball on the end of a 0.75-m string is swung in a horizontal circle. It travels at 3.4 m/s. What is the centripetal acceleration of the ball?

• 15 m/s²

• 0.18 m/s²

• 4.5 m/s²

• 41 m/s²

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NGSS.HS-PS2-1

A ball on a rope swung at a constant speed in a circle above your head is in uniform circular motion. In which direction does it accelerate?

• tangent to the circle, in the direction of motion

• outward, away from the center of the circle

• inward, toward the center of the circle

• upward, perpendicular to the plan of motion

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NGSS.HS-PS2-1

A ball on a rope swung at a constant speed in a circle above your head is in uniform circular motion. What force causes this?

• centripetal force, directed toward the center of the circle

• centrifugal force, directed outward from the center of the circle

• gravitational force, acting downward

• fictional force, opposing the motion

What is the direction of the force that acts on the clothes in the spin cycle of a top-load washing machine? What exerts the force?

• outward; exerted by the water

• toward the center; exerted by the drum of the washing machine

• downward; exerted by gravity

• horizontal; exerted by the air inside the drum

Tags

NGSS.HS-PS2-1