ROTATIONAL MOTION

If a system of particles has no external forces acting on it, what happens to the velocity of its center of mass?

• It increases continuously
• It decreases to zero
• It changes direction randomly
• It remains constant

What does Newton’s second law for a system of particles state in terms of momentum?

• F = ma for each particle only
• dP/dt = 0 always
• F = mv^2/r
• dP/dt = F_ext

What is the relationship between the total momentum of a system and the velocity of its center of mass?

• P = M/V
• P = M + V
• P = V/M
• P = MV

How is the total linear momentum of a system of particles defined?

• Product of total mass and velocity of any particle
• Scalar sum of all individual momenta
• Average of all individual momenta
• Vector sum of the momenta of all individual particles

What happens to the total linear momentum of a system when the net external force acting on it is zero?

• The momentum increases indefinitely
• The momentum decreases to zero
• The momentum changes direction randomly
• The total linear momentum remains constant