circular motion

A car in uniform circular motion moves counter-clockwise. At the top of the circle, what is the direction of velocity?

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A car moves in uniform circular motion. Which of the following must be true?

• The car’s velocity is constant
• The car’s acceleration is constant
• The car’s acceleration is directed toward the center
• The car’s acceleration is zero

An object in uniform circular motion moves clockwise. What is the direction of net force?

• A
• B
• C
• E

An object in uniform circular motion moves clockwise. What is the direction of acceleration?

• A
• B
• C
• E

A roller coaster is at the bottom of its loop. What is the sum of forces equation at that point?

• g = 9.8 m/s²
• F_n - F_g
• F_n + F_g
• F_g

A car moves just fast enough through a loop, barely touching the track. What is the car's acceleration at the top?

• g = 9.8 m/s²
• F_g
• F_n + F_g
• Need to know speed of car

A football player runs in a circle. Which of the following provides centripetal force?

• friction
• normal force
• gravity
• applied force

Which of the following provides centripetal force in a gravitron?

• friction
• normal force
• gravity
• applied force

A bucket is swung in a vertical circle. Which of the following provides centripetal force?

• friction
• normal force
• tension
• applied force

An object is in uniform circular motion. What happens to the force it experiences if the velocity is doubled?

• force doubles
• force is halved
• force is unchanged
• force is quadrupled