Circular Motion

As the moon orbits the earth, what keeps the moon moving in a circular motion?

• Gravity
• Inertia
• Centripetal Force
• Friction

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

Where is the net force when the rollercoaster is at the top of the loop?

• Towards the sky
• Towards the Right
• Towards the left
• Towards the ground

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

At the position shown in the diagram, which arrow indicates the direction the instantaneous (tangential) velocity of the cart?

• A

• B

• C

• D

Calculate the amount of centripetal force it takes for a softball pitcher to rotate a ball with a velocity of 3 m/s if the ball weighs .12 kg and her arm is .65 meters long.

• .38
• 1.23
• .55
• 1.66 N

A car is rounding a bend as shown in the diagram. Which arrow correctly shows the direction of the cars velocity?

• A

• B

• C

• D

A car is rounding a curve as shown in the diagram. Which arrow correctly shows the direction of the centripetal force keeping the car in circular motion?

• A

• B

• C

• D

A bola is an old hunting instrument. If three rocks with a combined mass of 0.75 kg are spun at a speed of 20 m/s with a radius of 0.5 m, how much centripetal force is required to keep them spinning.

• 600 N

• 45 N

• 30 N

• 400 N

A bola is an old hunting instrument. If three rocks with a combined mass of 0.75 kg are spun at a speed of 20 m/s with a radius of 0.5 m, how much centripetal force is required to keep them spinning.

• 600 N

• 45 N

• 30 N

• 400 N