Momentum Conservation in Systems

A car of mass 1000 kg is moving at a velocity of 20 m/s. Calculate the momentum of the car.

• 2000 kg·m/s

• 20000 kg·m/s

• 5000 kg·m/s

• 10000 kg·m/s

Tags

NGSS.HS-PS2-2

Which of the following statements best describes the law of conservation of momentum?

• Momentum is always conserved in a closed system.

• Momentum is conserved only when objects are at rest.

• Momentum is conserved only in elastic collisions.

• Momentum is never conserved.

Tags

NGSS.HS-PS2-2

Two ice skaters, one with a mass of 50 kg and the other with a mass of 70 kg, push off each other. If the 50 kg skater moves at 3 m/s, what is the velocity of the 70 kg skater?

• 2.14 m/s

• 3.00 m/s

• 1.50 m/s

• 2.14 m/s in the opposite direction

Tags

NGSS.HS-PS2-2

A 5 kg ball moving at 4 m/s collides with a stationary 3 kg ball. After the collision, the 5 kg ball moves at 2 m/s. What is the velocity of the 3 kg ball after the collision?

• 3.33 m/s

• 2.67 m/s

• 4.00 m/s

• 1.33 m/s

Tags

NGSS.HS-PS2-2

Explain how the conservation of momentum applies to a rocket launching into space.

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

• The momentum of the rocket is conserved by the expulsion of gas in the opposite direction.

• The rocket's momentum is conserved by the air resistance it encounters.

• The momentum is not conserved in this scenario.

Tags

NGSS.HS-PS2-2

A system consists of two carts on a frictionless track. Cart A has a mass of 2 kg and is moving at 3 m/s, while Cart B has a mass of 3 kg and is moving at 2 m/s in the same direction. What is the total momentum of the system?

• 12 kg·m/s

• 13 kg·m/s

• 10 kg·m/s

• 15 kg·m/s

Tags

NGSS.HS-PS2-2

A 10 kg object moving at 5 m/s collides with a 15 kg object moving at 3 m/s in the opposite direction. If they stick together after the collision, what is their final velocity?

• 0.2 m/s

• 1.0 m/s

• 2.0 m/s

• 1.5 m/s

Tags

NGSS.HS-PS2-2

If a system of particles is isolated and no external forces act on it, what can be said about the total momentum of the system?

• It increases over time.

• It decreases over time.

• It remains constant.

• It fluctuates randomly.

Tags

NGSS.HS-PS2-2

A 2 kg ball moving at 6 m/s collides head-on with a 3 kg ball moving at 4 m/s in the opposite direction. If the collision is perfectly elastic, and the velocity of the 2 kg ball is 4 m/s, what is the velocity of the 3 kg ball after the collision?

• -2.66 m/s

• 5 m/s

• 6 m/s

• 7 m/s

Tags

NGSS.HS-PS2-2

Which of the following images has more momentum?

• Object A
• Object B 
• They are the same

Tags

NGSS.HS-PS2-2