ROTATIONAL MOTION

How can you experimentally determine the centre of gravity of an irregular-shaped cardboard?

• By measuring its thickness
• By weighing its corners
• By hanging it from a string
• By balancing it on a narrow-tipped object like a pencil

Which force does the tip of the pencil provide when a cardboard is balanced on it?

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

What condition must be satisfied for a body to be in rotational equilibrium when balanced on a point?

• The net force must be zero
• The centre of mass must be above the base
• The total torque about the point of support must be zero
• The object must be symmetric

Where is the centre of gravity located in a body that is balanced on a narrow-tipped object like a pencil?

• At the geometric center
• At the heaviest part
• At the point where the total gravitational torque is zero
• At the topmost edge

If a force is doubled and the distance is halved, what happens to the moment?

• It doubles
• It halves
• It quadruples
• It remains the same