11. Momentum & Impulse

In a collision between two unequal masses, which of the following statements is always true for an isolated system?

In a frontal collision between two objects, which of the following statements is true if the collision is perfectly elastic?

A destroyer simultaneously fires two shells of equal mass in opposite directions. Assuming the destroyer is initially at rest and neglecting external forces, what type of collision best describes the interaction between the shells and the destroyer?

For an inelastic collision, which of the following statements is true?

A bullet of mass $m$ is fired horizontally at speed $v$ into a stationary block of mass $M$ resting on a frictionless surface. The bullet embeds itself in the block. What is the speed of the block/bullet system immediately after the collision?

Which of the following situations describes an elastic collision?

Which of the following best describes the difference between an elastic and an inelastic collision?

When two objects collide, which of the following best describes the possible outcomes of the collision?

If two objects collide and stick together after the collision, what type of collision has occurred?

In the context of kinetic theory, the mean free time is defined as the average time between collisions for a gas molecule. Which of the following best describes when a collision occurs for a gas molecule?

When two billiard balls of equal mass ($m$) undergo a perfectly elastic head-on collision, what happens to their velocities ($v$) after the collision?

In a car accident, the first collision occurs when the car hits an object. Which of the following would most likely occur as the direct result of the second collision, which involves the occupants inside the car?

A $20-\mathrm{ton}$ truck collides with a $1500-\mathrm{lb}$ car. Which of the following statements must be true?

During a crash, how many types of collisions typically occur?

During a brief collision between two objects, which of the following quantities is always conserved, regardless of whether the collision is elastic or inelastic?