Circular motion and centripetal force

Question 1

A 60 kg object moves in a circle of radius 10 m at 10 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

Answer N

Question 2

Friction between the tyres and the road provides 312.5 N of centripetal force for a 1000 kg car on a bend of radius 80 m. What is the car's speed, in m/s?

Answer m/s

Question 3

In which direction does the centripetal force on an object moving in a circle act?

• A. there is no force
• B. towards the centre of the circle
• C. forwards along the path
• D. outwards, away from the centre

Question 4

A 1200 kg object moves in a circle of radius 1 m at 10 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

Answer N

Question 5

Friction between the tyres and the road provides 750 N of centripetal force for a 1500 kg car on a bend of radius 50 m. What is the car's speed, in m/s?

Answer m/s

Question 6

A car goes round a bend twice as fast. How does the centripetal force needed change?

• A. it stays the same
• B. it becomes four times larger
• C. it doubles
• D. it halves

Question 7

A 60 kg object moves in a circle of radius 10 m at 5 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

Answer N

Question 8

Friction between the tyres and the road provides 8437.5 N of centripetal force for a 1500 kg car on a bend of radius 40 m. What is the car's speed, in m/s?

Answer m/s

Question 9

What provides the centripetal force for the Moon orbiting Earth?

• A. Earth's gravitational pull
• B. magnetism
• C. friction with space
• D. the Moon's engines

Question 10

A 1 kg object moves in a circle of radius 2 m at 5 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

Answer N

Question 11

Friction between the tyres and the road provides 3840 N of centripetal force for a 1200 kg car on a bend of radius 20 m. What is the car's speed, in m/s?

Answer m/s

Question 12

What provides the centripetal force for the Moon orbiting Earth?

• A. magnetism
• B. Earth's gravitational pull
• C. friction with space
• D. the Moon's engines

Question 13

A 800 kg object moves in a circle of radius 0.5 m at 4 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

Answer N

Question 14

Friction between the tyres and the road provides 1250 N of centripetal force for a 1000 kg car on a bend of radius 20 m. What is the car's speed, in m/s?

Answer m/s

Question 15

In which direction does the centripetal force on an object moving in a circle act?

• A. forwards along the path
• B. outwards, away from the centre
• C. there is no force
• D. towards the centre of the circle

Question 16

A 0.5 kg object moves in a circle of radius 0.5 m at 4 m/s. What centripetal force is needed, in N? (F = m v² ÷ r)

Answer N