ROTATIONAL MOTION

If two equal and opposite forces act along the same line, do they form a couple?

• Yes, always
• Only if they are large
• Only if separated
• No, because they are collinear

What is the dimensional formula of torque?

• [MLT⁻²]
• [ML²T⁻¹]
• [M²LT⁻²]
• [ML²T⁻²]

In rotational equilibrium, what is the net torque?

• Maximum
• Minimum
• Equal to force
• Zero

What is the role of the Earth's magnetic field on a compass needle?

• It attracts the needle
• It repels the needle
• It heats the needle
• It exerts a couple on the needle

If the effort is applied closer to the fulcrum than the load, what happens to mechanical advantage?

• It becomes infinite
• It remains one
• It increases
• It becomes less than one