ROTATIONAL MOTION

How does the rigidity of a body affect the calculation of total work done by multiple torques?

• It increases friction
• It makes work zero
• It ensures all particles undergo the same angular displacement dθ
• It reduces torque

What is the physical meaning of the expression τ₁dθ?

• Power generated
• Angular momentum change
• Work done by torque τ₁ during angular displacement dθ
• Linear impulse

Why is the torque due to the OC component of OP₁ neglected?

• Because it is too short
• Because it acts in vacuum
• Because OC is parallel to the axis of rotation and produces no rotational effect
• Because it cancels other torques

What is the role of the tangent at P₁ in determining work done by a force?

• It measures angular speed
• It determines mass
• It defines the direction of instantaneous displacement
• It gives torque magnitude

How is the tangential displacement ds₁ related to angular displacement dθ?

• ds₁ = dθ/r₁
• ds₁ = r₁²dθ
• ds₁ = ωdθ
• ds₁ = r₁dθ