ROTATIONAL MOTION

In what situations can the rigid body model be used effectively?

• Only in zero gravity
• When the body is very small
• When the body is hollow
• When deformations are negligible under applied forces

What happens to a real body when forces are applied, according to the text?

• It becomes massless
• It turns into a particle
• It deforms
• It disappears

Why can planets be treated as rigid bodies in orbital mechanics?

• They are made of gas
• They have no mass
• They rotate very slowly
• Their shape changes are negligible compared to their size

Which of the following real-world objects is often modeled as a rigid body?

• Rubber band
• Jelly
• Cloud of gas
• Steel beam

What defines a rigid body in classical mechanics?

• It has zero mass
• Its shape changes easily
• It is always at rest
• The distances between all pairs of particles remain constant