câu hỏi trắc nghiệm nhóm 8 (12+33)

What is the definition of momentum in physics?

• Speed of an object

• Force exerted by an object

• Mass multiplied by velocity

• Acceleration of an object

Calculate the momentum of an object with a mass of 5 kg moving at a velocity of 10 m/s.

• 15 kg m/s

• 20 kg m/s

• 25 kg m/s

• 50 kg m/s

According to the law of conservation of momentum, what happens to the total momentum of a system of objects in the absence of external forces?

• Increases

• Decreases

• Remains constant

• Reverses direction

Reverses direction

• Always greater

• Always smaller

• Always the same

• Depends on the masses

How does impulse relate to momentum?

• Impulse is the change in momentum

• Impulse is the product of force and time

• Impulse is inversely proportional to momentum

If an object has a momentum of 30 kg m/s and its velocity is 6 m/s, what is its mass?

• 2 kg

• 3 kg

• 4 kg

• 5 kg

When is momentum conserved in a collision between two objects?

• Only in elastic collisions

• Only in inelastic collisions

• In both elastic and inelastic collisions

• Momentum is never conserved in collisions
  

A 5000 kg truck is moving at 20 m/s. What is its momentum?

• 100,000 kg m/s

• 50,000 kg m/s

• 10,000 kg m/s

• 5,000 kg m/s

In a collision, what does the term "elastic" mean?

• Kinetic energy is conserved

• Kinetic energy is not conserved

• Momentum is conserved

• Momentum is not conserved

A ball X of mass 1 kg travelling at 2 m/s has a head-on collision with an identical ball Y at rest. X stops and Y moves off. What is Y’s velocity?

• 2 m/s

• 3 m/s

• 4 m/s

• 5 m/s