Unit 9 Review-Circular Motion/Universal Gravitation

A ball on a string is spun around in a circle. Which of the following quantities is not constant?

• mass

• force

• velocity

• acceleration

A yo-yo is whirled on a string, then the string breaks. What causes the yo-yo to move off in a straight line?

• centrifugal force

• centripetal force

• inertia

• centripetal acceleration

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

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

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

A ball on a string is traveling 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.

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

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

Tags

NGSS.HS-PS2-1

You swing a bucket of water attached to a string in a circle above your head. What keeps the water in the bucket?

• Friction
• Centripetal Force
• Gravity
• Inertia

Tags

NGSS.HS-PS2-1

Which represents the acceleration of the ball?

• A
• B
• C
• D

Tags

NGSS.HS-PS2-1