ROTATIONAL MOTION

Where is the center of the circular path of a particle in a rigid body undergoing rotation about a fixed axis?

• At the origin
• On the axis of rotation
• At the circumference of the circle
• Outside the plane of motion

What is the result of the cross product of two vectors if one is a scalar multiple of the other?

• The vector itself
• Zero vector
• A unit vector
• k times the vector

If a rigid body rotates with angular velocity ω, what is the linear velocity of a particle at position r from the axis?

• ω · r
• ω + r
• ω × r
• r × ω

What is the direction of the vector (ĵ × î)?

• k̂ direction
• -k̂ direction
• î direction
• ĵ direction

What is the value of (î × ĵ) · k̂?

• 0
• 1
• -1
• k̂