Circular Motion

A particle P is moving in a circle with uniform speed. Which one of the following diagrams correctly shows the direction of the acceleration a and velocity v of the particle at one instant of time?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-1

Which of the following depict the speed of the blowing ball?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-1

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

• outwards

• towards the center

• tangent

• faster

What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?

• 5 m/s²

• 17.63 m/s²

• 10 m/s²

• 8.81 m/s²

Tags

NGSS.MS-PS3-5

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.

Tags

NGSS.HS-PS2-1

Why do sharp turns in roads have reduced speed limits posted?

• The lower the speed the lower centripetal force.

• The lower the speed the higher centripetal force.

• The lower the speed the larger the radius.

• Speed limits aren't reduced on sharp turns.

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

Tags

NGSS.MS-PS3-1

Centrifugal force is a ______

• force that pushes you to the outside of a circle during uniform circular motion.

• fictitious force that is really just the linear motion of an object in uniform circular motion.

• The force that keeps the planets in orbit

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

• outwards

• towards the center

• tangent

• faster

Calculate the velocity of an object moved around a circle with a radius of 1.65 m and an acceleration of 3.5 m/s².

• 2.4 m/s

• 3.6 m/s

• 3.9 m/s

• 4.2 m/s