ROTATIONAL MOTION

How does the motion of a rigid body differ from that of a particle?

• It cannot move at all
• It only rotates
• It only translates
• A rigid body can have both translational and rotational motion

What is the significance of the center of mass in the motion of a system of particles?

• It is always at the geometric center
• It is the point with zero mass
• It moves randomly
• It moves as if all the mass were concentrated there and all external forces acted on it

Why is the concept of a system of particles important in studying extended bodies?

• Because all particles move independently
• Because particles have no mass
• Because an extended body can be viewed as a collection of particles
• Because particles cannot interact

What is the primary limitation of treating a real body as a particle?

• It assumes zero mass
• It ignores the finite size and shape of the body
• It assumes infinite speed
• It only applies to liquids

Which of the following best describes a particle in physics?

• An extended body with volume
• A body with changing shape
• A point mass with no size
• A body that always rotates