ROTATIONAL MOTION

What is the significance of the angle ∠P₁CP₁′ in rotational motion?

• It measures linear distance
• It gives the torque direction
• It represents the angular displacement dθ of the particle
• It indicates force direction

Why is the angular displacement dθ the same for all particles in a rigid body?

• Because they have the same mass
• Because they move at the same speed
• Because the body rotates as a single unit without internal deformation
• Because gravity affects them equally

What is the direction of the radius vector CP₁ in circular motion?

• From P₁ to C
• Along the tangent
• From point C to point P₁
• Perpendicular to the plane

What is the primary reason for considering only forces in planes perpendicular to the axis of rotation?

• They are easier to calculate
• They reduce friction
• Forces in perpendicular planes can produce torque about the axis
• They act at the center

What is the role of the origin O in torque calculation?

• It is irrelevant
• It defines angular speed
• It is used to define position vector but only perpendicular component matters
• It measures force