ROTATIONAL MOTION

Under what condition is torque zero?

• When force is perpendicular
• When r is large
• When F is large
• When force is parallel to the position vector

What factors determine the magnitude of torque?

• Only force
• Only distance
• Only angle
• Force magnitude, distance from axis, and angle of application

What is another name for moment of force?

• Work
• Energy
• Power
• Torque

What makes a force most effective in rotating a door?

• Pushing near hinge
• Pulling parallel to door
• Applying it perpendicularly at the outer edge
• Pushing at center

Why is force applied at the hinge ineffective in opening a door?

• Because of high friction
• Because the door is heavy
• Because the moment arm is zero
• Because force is small