Physics Quiz: Equilibrium of Rigid Bodies

What is the condition for a rigid body to be in mechanical equilibrium?

• Constant linear momentum and non-zero angular momentum

• Constant angular momentum and non-zero linear momentum

• Constant linear momentum and constant angular momentum

• Non-zero linear momentum and non-zero angular momentum

What is the translational motion of the centre of mass of a rigid body governed by?

• Net external force

• Net internal torque

• Net internal force

• Net external torque

What is the condition for a body to be in static equilibrium?

• Constant linear momentum and constant angular momentum

• Zero linear momentum and zero angular momentum

• Constant angular momentum and non-zero linear momentum

• Constant linear momentum and non-zero angular momentum

What is the centre of gravity of an object?

• The average location of the weight of an object

• The point where the weight of an object is maximum

• The point where the weight of an object is minimum

• The point where the weight of an object is zero

What is the net torque about the centre of mass of a body in equilibrium?

• Cannot be determined

• Depends on the origin of coordinates

• Non-zero

• Zero

What is the condition for stable equilibrium?

• Object returns to its original position if displaced slightly

• Object does not move if displaced slightly

• Object stays in its new position if displaced slightly

• Object moves farther away from its original position if displaced slightly

What is the condition for unstable equilibrium?

• Object returns to its original position if displaced slightly

• Object moves farther away from its original position if displaced slightly

• Object does not move if displaced slightly

• Object stays in its new position if displaced slightly

What is the condition for neutral equilibrium?

• Object moves farther away from its original position if displaced slightly

• Object returns to its original position if displaced slightly

• Object does not move if displaced slightly

• Object stays in its new position if displaced slightly

What is the net external force for the translational motion of a rigid body?

• Cannot be determined

• Non-zero

• Zero

• Depends on the origin of coordinates

What is the net external torque for the rotational motion of a rigid body?

• Zero

• Non-zero

• Depends on the origin of coordinates

• Cannot be determined