ROTATIONAL MOTION

What physical quantity is conserved when external force is zero?

• Acceleration
• Force
• Linear momentum
• Displacement

What is the trajectory of a free particle?

• Circular path
• Parabolic path
• Straight line at constant speed
• Spiral path

In a two-body decay with center of mass at rest, what is the relationship between the momenta of the products?

• Same direction
• Perpendicular
• Equal in magnitude, opposite in direction
• Unrelated

Why is the center of mass frame useful in studying radioactive decay?

• It increases energy
• It makes decay slower
• It simplifies the motion of decay products
• It stops the decay

What happens to the total momentum vector in an isolated system?

• It increases
• It decreases
• It changes direction randomly
• It remains constant