ROTATIONAL MOTION

What is the role of trial and error in finding the CG of an irregular object?

• It increases weight
• It damages the object
• It measures temperature
• It helps locate the point where torque balance occurs

How is the centre of gravity different from the centre of mass in theory?

• CG is always lower
• COM is heavier
• CG depends on gravity, COM depends only on mass distribution
• They are identical in all cases

What is the effect of increasing mass on the position of the centre of gravity?

• It remains unchanged
• It disappears
• It shifts toward the added mass
• It moves upward

Why doesn't the cardboard fall when supported at CG?

• Because it is light
• Because of magnetic force
• Because it is glued
• Because it is in mechanical equilibrium

What determines the lever arm in gravitational torque calculation?

• Mass of the particle
• Color of the object
• Angle of view
• Perpendicular distance from CG to line of force