Circular Motion and Gravity

A 12 kg object undergoes circular motion with a radius of 4 m and a speed of 18 m/s. What is the centripetal acceleration of the object?

• 1.125 m/s²

• 81 m/s²

• 4.5 m/s²

• 36 m/s²

Tags

NGSS.HS-PS2-1

The diagram shows an object traveling at a constant speed in a circular path. Which labeled arrow represents the centripetal force acting on the object?

• W

• Z

• X

• Y

Tags

NGSS.HS-PS2-1

A ball on a string is travelling in circular motion. Which vector represents the centripetal force?

• The green vector because it points towards the center of the circular path
• The blue vector because it shows the direction of the object's inertia
• The green vector because it shows the path of the ball
• The blue vector because this is the way the ball will move when it is released.

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

Which vector represents the acceleration of the ball?

• A

• B

• C

• D

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up

• right

• down

• left

Centripetal acceleration always points

• in the direction of the object's motion

• in the opposite direction of the object's motion

• towards the center of the circle

• towards the outside of the circle

Two objects are attracted to each other with 36 N of gravitational force.

What would the force between them be if the distance between them were doubled?

• 9

• 18

• 72

• 144

Two objects are attracted to each other with 36 N of gravitational force.

What would the force between them be if the distance between them were halved?

• 9

• 18

• 72

• 144

Two objects are attracted to each other with 36 N of gravitational force.

What would the force between them be if both of the masses were doubled?

• 9

• 18

• 72

• 144