ROTATIONAL MOTION

What is the mathematical expression for translational equilibrium?

• Στi = 0
• ΣFi = 0
• ΣLi = 0
• Σvi = 0

What is the condition for translational equilibrium of a rigid body?

• The total torque is zero
• The total force on the body is zero
• The angular momentum is zero
• The body is at rest

What defines mechanical equilibrium for a rigid body?

• Only linear momentum is constant
• Only angular momentum is constant
• Velocity is zero
• Both linear and angular momentum remain constant

When is angular momentum of a particle conserved?

• When no external force acts
• When no external torque acts on it
• When velocity is constant
• When the path is circular

What is the direction of angular momentum for a particle moving in a plane, as per the right-hand rule?

• Along the direction of r
• Along the direction of v
• Opposite to v
• Perpendicular to the plane of r and v