ROTATIONAL MOTION

What is the unit vector associated with the axis of rotation?

• î
• ĵ
• k̂
• n̂

In the absence of external torque, if I doubles, what happens to ω?

• ω doubles
• ω remains same
• ω becomes half
• ω becomes zero

What is the significance of Lz = Iω in rotational dynamics?

• It relates force and acceleration
• It gives kinetic energy
• It calculates torque
• It relates angular momentum to angular velocity

Why is dL⊥/dt = 0 in fixed-axis rotation?

• Because L⊥ is zero
• Because torque is zero
• Because ω is constant
• Because the axis constrains motion to one plane

What determines the direction of the angular momentum vector in fixed-axis rotation?

• Direction of velocity
• Mass distribution
• Axis of rotation
• Applied force