ROTATIONAL MOTION

What is implied by L = constant in angular momentum conservation?

• Speed is constant
• Only direction is fixed
• Only magnitude is fixed
• Total angular momentum does not change in time

Why is angular momentum a vector quantity?

• It is always positive
• It depends on scalar mass
• It has magnitude and direction in space
• It is measured in joules

In the expression τ = Σ r_i × F_i, what does F_i represent?

• Only external force
• Only internal force
• Gravitational force only
• Vector sum of external and internal forces on ith particle

What determines the direction of torque?

• Direction of r only
• Direction of F only
• Left-hand rule
• Right-hand rule applied to r × F

How does angular momentum conservation compare to linear momentum conservation?

• They are unrelated
• Both require rigid bodies
• Both occur when net external influence is zero
• They only apply in circular motion