ROTATIONAL MOTION

What condition must be satisfied for the cardboard to be in translational equilibrium?

• The torque must be maximum
• The mass must be zero
• The reaction force must equal the weight Mg
• The object must rotate

What force does the pencil tip exert on the cardboard during balancing?

• Gravitational force
• Electromagnetic force
• Tension force
• Vertically upward reaction force

Why does the cardboard remain horizontal when balanced at point G?

• Because air pressure holds it
• Because it has uniform density
• Because the pencil is sharp
• Because the total gravitational torque about G is zero

How can you experimentally locate the centre of gravity of an irregular cardboard?

• By weighing it in water
• By measuring its thickness
• By hanging it from a string
• By balancing it on the tip of a pencil

What is the primary purpose of identifying the centre of gravity in a body?

• To measure its mass
• To calculate its volume
• To determine the point where gravitational torque is zero
• To find its geometric center