Circular motion

The direction of centripetal force is:

• 1 Tangent to the circle
• 2 Away from the centre
• 3 Towards the centre
• 4 Along the velocity

An object moves in a circle of radius 2 m at 4 m/s. What is its centripetal acceleration?

• 1 4 m/s2
• 2 16 m/s2
• 3 2 m/s2
• 4 8 m/s2

Angular velocity of a wheel making 60 revolutions per minute is:

• 1 2 pi rad/s
• 2 pi rad/s
• 3 120 pi rad/s
• 4 60 rad/s

The relation between linear speed v and angular speed omega is:

• 1 v = r / omega
• 2 v = r omega
• 3 v = omega / r
• 4 v = omega2 r

Artificial gravity in a rotating space station comes from:

• 1 Nuclear force
• 2 Magnetism
• 3 Air pressure
• 4 Centripetal force from the floor