Impulse and Momentum in Action (38)

What is the formula for momentum?

Which of the following best describes the conservation of momentum?

• Momentum is always increasing.

• Momentum is always decreasing.

• Momentum is conserved in an isolated system.

• Momentum is only conserved in elastic collisions.

A rocket in space expels gas at high speed. What principle explains the rocket's forward motion?

• Conservation of energy

• Conservation of momentum

• Conservation of mass

• Conservation of velocity

Calculate the momentum of a 5 kg object moving at 10 m/s.

• 50 kg·m/s

• 5 kg·m/s

• 10 kg·m/s

• 100 kg·m/s

If a force of 10 N is applied to an object for 3 seconds, what is the impulse experienced by the object?

• 30 N·s

• 3 N·s

• 10 N·s

• 13 N·s

Explain how the impulse-momentum theorem applies to a car crash.

• The impulse-momentum theorem states that the change in momentum is equal to the impulse applied to it, which helps in understanding how airbags reduce the force on passengers.

• The impulse-momentum theorem states that momentum is conserved, which explains why cars bounce back after a crash.

• The impulse-momentum theorem states that energy is conserved, which explains why cars stop after a crash.

• The impulse-momentum theorem states that mass is conserved, which explains why cars remain intact after a crash.

A 2 kg ball is moving at 4 m/s. What is its momentum?

• 8 kg·m/s

• 6 kg·m/s

• 4 kg·m/s

• 2 kg·m/s

Which of the following is an example of an impulse?

• A car maintaining a constant speed

• A bat hitting a baseball

• A book resting on a table

• A person walking at a steady pace

A rocket with a mass of 1000 kg expels gas at a velocity of 500 m/s. What is the change in momentum of the rocket if 2 kg of gas is expelled?

• 1000 kg·m/s

• 500 kg·m/s

• 2000 kg·m/s

• 1500 kg·m/s

Describe how momentum is conserved in a rocket launch.

• The rocket's momentum is conserved by the gravitational pull of the Earth.

• The momentum of the expelled gas is equal and opposite to the momentum gained by the rocket, conserving total momentum.

• The momentum is conserved by the air resistance acting on the rocket.

• The momentum is conserved by the energy stored in the rocket's fuel.