ROTATIONAL MOTION

If ω is along +z and r is along +x, what is the direction of v = ω × r?

• Along -y
• Along +y
• Along +z
• Along -x

What is the direction of the linear velocity vector for a particle rotating counterclockwise in the xy-plane?

• Radially outward
• Radially inward
• Tangential, in the direction of rotation
• Opposite to angular velocity

What is the physical significance of the vector product in rotational motion?

• It calculates torque
• It finds angular momentum
• It relates linear and angular velocity
• It measures force

What is the k̂ component of a × b?

• a_x b_z - a_z b_x
• a_y b_z - a_z b_y
• a_x b_y - a_y b_x
• a_z b_x - a_x b_z

What is the ĵ component in the cross product a × b?

• a_x b_z - a_z b_x
• -(a_x b_z - a_z b_x)
• a_y b_z - a_z b_y
• a_x b_y - a_y b_x