ROTATIONAL MOTION

What type of motion does a couple produce on a free rigid body?

• Linear motion
• Vibrations
• No motion
• Pure rotation

If the load is 100 N and the mechanical advantage is 4, what is the effort required?

• 400 N
• 100 N
• 50 N
• 25 N

What is the relationship between load, load arm, effort, and effort arm at equilibrium?

• Load + effort = total force
• Load arm + effort arm = total length
• Load/effort = effort arm/load arm
• Load arm × load = effort arm × effort

What is the significance of the lever being 'light' in the ideal case?

• It moves faster
• It is invisible
• It reduces friction
• Its mass is negligible so it doesn't contribute to moments

How is the vector AB related to the position vectors r₁ and r₂?

• AB = r₁ + r₂
• AB = r₁ - r₂
• AB = r₁
• AB = r₂ - r₁