ROTATIONAL MOTION

Three identical particles are placed at the vertices of an equilateral triangle. Where is the center of mass located?

• At one vertex
• At the midpoint of a side
• At the circumcenter
• At the centroid of the triangle

For a system of particles, what is the relationship between net external force and the acceleration of the center of mass?

• F_net = M*v_cm
• F_net = M/x_cm
• F_net = M*a_cm
• F_net = a_cm/M

Which physical law explains why the center of mass of an isolated system moves with constant velocity?

• Newton's second law
• Newton's third law
• Law of gravitation
• Newton's first law of motion

If a system of particles has zero momentum, where is its center of mass moving?

• With constant acceleration
• With increasing velocity
• With zero velocity
• It is rotating

How does the center of mass of a system change when mass is added to one side?

• It does not change
• It shifts away from the added mass
• It shifts toward the side where mass is added
• It disappears