Circular Motion & Torque Review

What happens to the centripetal force exerted on an object if you triple the velocity?

• it increases to 3X
• it decreases to 6X
• it increases to 6X
• it increases to 9X

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

Tags

NGSS.HS-PS2-1

Calculate the centripetal force required to make a 5 kg ball move 4 m/s in a circle with a radius of 2 m.

• 10 N
• 20 N
• 30 N
• 40  N

Tags

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

Centripetal acceleration acts towards the ___________ of the circular motion

• centre
• circumference

A horse gallops around a circular arena.  The centripetal force on the horse is ___.

• directed outward
• tension
• directed toward the center of the arena
• 9.8 N

A ball is moving at constant speed around the circle. Which letter represents the acceleration of the ball?

• A

• B

• C

• D

• Nonsense. The ball can't be accelerating while moving at a constant speed.

Tags

NGSS.HS-PS2-1

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

• A
• B
• C
• D

Tags

NGSS.MS-PS3-1

Calculate the mass of an object if it took 20 N 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

Tags

NGSS.HS-PS2-1

Why do objects experience centripetal acceleration even though they can have a constant speed?

• Because they are speeding up as they move in a circle

• Because they are constantly changing direction and hence, velocity changes, and that 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.