AP Physics C: Momentum, Impulse, Collisions and Center of Mass Review (Mechanics)

The video covers key concepts in AP Physics C Mechanics, focusing on momentum, impulse, and center of mass. It explains momentum as mass times velocity, discusses Newton's second law in terms of momentum, and explores the conditions for conservation of momentum. The impulse-momentum theorem is derived, and the differences between elastic and inelastic collisions are highlighted. The video also explains how to calculate the center of mass for systems of particles and rigid objects, including the use of density equations.

What is the equation for momentum?

• Momentum equals mass times velocity

• Momentum equals force times time

• Momentum equals mass times acceleration

• Momentum equals velocity times time

When can we apply the conservation of momentum?

• When all forces are external

• When the system is at rest

• When all forces are internal

• When the net force is non-zero

What is impulse defined as?

• The change in mass over time

• The change in velocity over time

• The product of force and time

• The product of mass and velocity

How is impulse related to momentum?

• Impulse is the product of momentum and time

• Impulse is the derivative of momentum

• Impulse is the sum of initial and final momentum

• Impulse is the integral of force with respect to time

What distinguishes elastic collisions from inelastic collisions?

• Kinetic energy is not conserved in elastic collisions

• Momentum is conserved only in inelastic collisions

• Kinetic energy is conserved in elastic collisions

• Momentum is not conserved in elastic collisions

In a perfectly inelastic collision, what happens to the colliding objects?

• They move in opposite directions

• They stick together

• They explode

• They bounce off each other

How is the position of the center of mass of a system of particles calculated?

• By summing the masses of all particles

• By averaging the velocities of all particles

• By integrating the force over time

• By dividing the sum of mass times position by total mass

What is the relationship between the velocity of the center of mass and the position of the center of mass?

• Velocity is the sum of all positions

• Velocity is the integral of position with respect to time

• Velocity is the derivative of position with respect to time

• Velocity is the product of mass and position

What is the volumetric mass density?

• Mass divided by surface area

• Mass divided by volume

• Mass divided by length

• Mass divided by time

Which Greek letter is used to denote linear mass density?

• Sigma

• Rho

• Lambda

• Alpha