Momentum and Impulses

We experience momentum as the feeling of moving objects, but momentum is better described as

• an object's velocity

• the acceleration of an object.

• mass x velocity

• mass x acceleration

Suppose a block is sliding on a smooth surface. Another identical block is stacked on top of it, but the speed is adjusted to stay the same. The total momentum of the object ___________________.

• doubles

• triples

• stays the same

• decreases.

A 0.5 kg baseball flies through the air at 8 m/s. A baseball bat hits the ball with three times the momentum it had before. Find the momentum of the ball.

• 12 kg x m/s

• 16 kg x m/s

• 4 kg x m/s

• 24 kg x m/s

A particle going at 300 m/s collides with a second particle of equal mass at rest. In the absence of friction forces, the velocity of the second particle after the collision will be

• 0 m/s

• 150 m/s

• 300 m/s

• 600 m/s

Calculate the impulse of a truck applying a net force of 2,000 N to accelerate for 4 seconds.

• 2,000 kg x m/s

• 4,000 kg x m/s

• 6,000 kg x m/s

• 8,000 kg x m/s

An impulse is ___________________.

• the amount of force applied in a period of time

• the amount of momentum over time

• equal to an object's velocity

• a pulse of energy shooting through space

Which has more momentum, a .013 kg projectile moving at 600 m/s or a 2,500 kg truck moving at 15 m/s?

• the projectile

• the truck

• they are the same.

The momentum of an object at rest is

• 0 m/s

• 0 kg

• 0 kg x m/s

• equal to the potential energy

Tags

NGSS.HS-PS2-2

Which of the following ways could change an object's momentum? Select all that apply.

• change the velocity of the object

• change the mass of the object

• apply a force to the object

• change the position

Calculate the momentum of a 2 kg book sliding on a frictionless surface at 2 m/s.

• 2 kg x m/s

• 4 kg x m/s

• 0 kg x m/s

• 1 kg x m/s

Tags

NGSS.HS-PS2-2