Conservation of Momentum - Physics 101 / AP Physics 1 Review with Dianna Cowern

The video explores the concept of momentum, its relation to Newton's Second Law, and the idea of impulse. It discusses real-life applications, such as safety features in cars, and explains the conservation of momentum with examples like rockets. The lesson concludes with a brief mention of quantum mechanics and the Heisenberg uncertainty principle.

What is the primary focus of Newton's second law as discussed in the lesson?

• Force is proportional to mass.

• Force is proportional to acceleration.

• Force is proportional to velocity.

• Force is proportional to a change in momentum.

Which of the following best describes momentum?

• A measure of an object's resistance to motion.

• A measure of an object's mass and velocity.

• A measure of an object's speed.

• A measure of an object's energy.

How does momentum differ from inertia?

• Momentum is a measure of force, while inertia is a measure of acceleration.

• Momentum is a measure of motion, while inertia is a measure of resistance to motion.

• Momentum is a measure of energy, while inertia is a measure of speed.

• Momentum is a measure of mass, while inertia is a measure of velocity.

What is impulse in the context of physics?

• A change in velocity over time.

• A force applied over a distance.

• A change in mass over time.

• A force applied over time.

Why do cars have airbags according to the lesson?

• To increase the force during a collision.

• To decrease the mass of the car.

• To increase the time of impact and reduce force.

• To decrease the time of impact.

What principle explains the motion of rockets?

• Conservation of mass.

• Conservation of momentum.

• Conservation of energy.

• Conservation of velocity.

How does the conservation of momentum apply to a rocket launch?

• The rocket's mass increases as it ascends.

• The momentum of expelled gas is equal and opposite to the rocket's momentum.

• The rocket's velocity decreases as it ascends.

• The momentum of the rocket is conserved by increasing its mass.

What happens to the train's speed when sand is dropped from it, according to the lesson?

• The train's speed remains the same.

• The train slows down.

• The train speeds up.

• The train stops.

What is the Heisenberg uncertainty principle related to?

• The inability to know an object's force and acceleration simultaneously with precision.

• The inability to know an object's energy and speed simultaneously with precision.

• The inability to know an object's mass and velocity simultaneously with precision.

• The inability to know an object's position and momentum simultaneously with precision.

What is a key takeaway about momentum from the lesson?

• Momentum is always changing.

• Momentum is never conserved.

• Momentum is always conserved in a closed system.

• Momentum is only conserved in open systems.