ROTATIONAL MOTION

Why is the mass of an ideal lever considered negligible?

• To make it invisible
• To reduce cost
• To increase speed
• To ignore its weight in calculations

What is the significance of the fulcrum being along the length of the lever?

• It reduces mass
• It increases friction
• It balances weight automatically
• It allows different arm lengths for mechanical advantage

What happens if the sum of moments is not zero in a lever?

• It moves linearly
• It breaks
• It becomes weightless
• The lever will rotate

In a seesaw, what role does the child on one side play?

• Always the load
• Always the effort
• Neither load nor effort
• Load or effort depending on position

What is the torque produced by the reaction force at the fulcrum?

• R × d
• R × 0.5d
• R
• Zero