ROTATIONAL MOTION

What is the role of the effort in a lever system?

• To support the fulcrum
• To measure distance
• To create friction
• To lift the load

Can a single force produce the same rotational effect as a couple?

• Yes, always
• Only in space
• Only if large
• No, because a single force causes translation

What is the mechanical advantage if effort arm is 3 m and load arm is 1 m?

• 0.33
• 1
• 2
• 3

In the moment calculation of a couple, what is r1 × (-F) + r2 × F equivalent to?

• (r1 + r2) × F
• r1 × r2 × F
• F × F
• (r2 - r1) × F

What is the effect of a couple on a rigid body?

• Pure translation
• Vibration
• No motion
• Pure rotation