Circular Motion Concepts

What is uniform circular motion?

• An object accelerating in a circular path

• An object moving in a spiral path

• Uniform circular motion is the motion of an object moving in a circular path at a constant speed.

• Motion in a straight line at varying speeds

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NGSS.MS-PS3-1

How does centripetal acceleration relate to circular motion?

• Centripetal acceleration pushes objects away from the center of the circle.

• Centripetal acceleration is only relevant in linear motion.

• Centripetal acceleration increases as the radius of the circle increases.

• Centripetal acceleration is necessary for an object to maintain circular motion, directed towards the center of the circle.

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NGSS.HS-PS2-2

Define angular velocity and its significance in circular motion.

• Angular velocity is the measure of force applied in circular motion.

• Angular velocity is the speed of an object in a straight line.

• Angular velocity is the distance traveled by an object in circular motion.

• Angular velocity is the rate of change of angular displacement; it is significant in circular motion as it relates to linear velocity and centripetal acceleration.

When a car goes around a circular curve on a level road, ...

• no frictional force is needed because the car simply follows the road.

• the frictional force of the road on the car increases when the car's speed decreases.

• the frictional force of the road on the car increases when the car's speed increases.

• the frictional force of the road on the car increases when the car moves to the outside of the curve.

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NGSS.HS-PS2-1

Centripetal force is...

• the inward force acting on a body moving at constant speed in a circle

• the outwards force acting on a body moving at constant speed in a circle

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

• outwards

• towards the center

• tangent

• faster

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

• outwards

• towards the center

• tangent

• faster

A race car completes three laps of a circular track with a radius of 35 m in 9.0 seconds. Determine the speed of the car.

• 3.9 m/s

• 73.3 m/s

• 24.4 m/s

• 1.0 m/s

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NGSS.MS-PS3-1

An object moves in a circular path at a constant speed.  Compare the direction of the object's velocity and acceleration vectors.    
Both vectors point in the same direction.  
The vectors point in opposite directions.  
The vectors are perpendicular.  
The question is meaningless, since the acceleration is zero

• Both vectors point in the same direction.

• The vectors point in opposite directions.

• The vectors are perpendicular.

• The question is meaningless, since the acceleration is zero

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NGSS.HS-PS2-1