Ch 9&10: Circular Motion

Which represents the acceleration of the ball?

• A
• B
• C
• D

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

You are moving a ball in a circle using 72 N of centripetal force. What would the force be if you doubled the radius of the circle?

• 18 N

• 36 N

• 72 N

• 144 N

What's the centripetal acceleration of a .2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

• 8.23 m/s²

• 10.54 m/s²

• 12.86 m/s²

• 17.39 m/s²

What's the centripetal force of a .2 kg yoyo spun in a circle with a radius of .7 meters at a velocity of 3 m/s?

• 2.05 N

• 2.57 N

• 2.90 N

• 3.13 N

Centripetal force produces acceleration of an object moving in circular path whose direction is _________________________of the circular path.

• away from the center

• towards the center

• clockwise

• counterclockwise

In uniform circular motion, the _______________________of an object is constant but the __________ is continually changing.

• speed, acceleration

• speed, direction

• acceleration, speed

• acceleration, velocity

In circular motion, the velocity is always ________ to the line of a circle.

• outwards

• towards the center

• tangent

• faster

Which statement is true about an object that is traveling in uniform circular motion?

• The speed of the object varies.
• The net force on the object is directed toward the center of the circular path.
• The direction of the object's velocity is constant.
• The net force on the object is directed away from the center of the circular path.

Which of the following is the unit for centripetal force?

• J
• m/s²
• kg⋅m/s
• N