Momentum

Suppose a girl is standing on a frozen pond where there is no friction between her feet and the ice. What must she do in order to get off the ice?

• Bend over touching the ice in front of her, then bring her feet to her hands.
• Get on her hands and knees and crawl off the ice.
• Throw something in the direction opposite to that in which she wants to go.
• Walk very slowly on tiptoe.

Tags

NGSS.MS-PS2-2

A freight train rolls along a track with considerable momentum. What would its momentum be if it were to roll at the same speed but had twice as much mass?

• Doubled
• Quadrupled
• Unchanged
• Zero

Tags

NGSS.HS-PS2-2

A large moving ball collides with a stationary small ball. What happens to the momentum?

• The momentum of the larger ball decreases and the momentum of the smaller ball increases.

• The momentum of the smaller ball decreases and the momentum of the larger ball increases.

• The momentum of the larger ball increases and the momentum of the smaller ball increases.

• The momentum does not change for either ball.

Tags

NGSS.HS-PS2-2

A tennis ball and a baseball have the same size and shape, but the baseball is twice as massive as the tennis ball. They are dropped simultaneously from a tower, and they reach the ground at the same time. Which of the following quantities will be higher for the baseball?

• Acceleration
• Momentum
• Speed
• Spring Constant

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

In order to catch a ball, a baseball player moves his hand backward in the direction of the ball’s motion. Why does this reduce the force of impact on the player’s hand?

• The time of impact is decreased.
• The time of impact is increased.
• The momentum of impact is reduced.
• The velocity of impact is reduced.

Tags

NGSS.HS-PS2-3

While standing on a skateboard, a student throws her book bag forward. Which of the following statements are true?

• Conservation of momentum would not hold.

• The book bag will travel faster than the student.

• The book bag will travel slower than the student.

• The book bag and the student will travel at the same speed.

Tags

NGSS.HS-PS2-2

What is equal to the change in an object’s momentum?

• Force acting on it
• Impulse acting on it
• Object’s mass times the force acting on it
• Velocity change of the object

Tags

NGSS.HS-PS2-2

If the momentum of an object changes and its mass remains constant, what else is happening to the object?

• Its velocity is changing.
• It is accelerating.
• There is a force acting on it.
• All of these responses are correct.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

When is the momentum of a system conserved?

• Only during an elastic collision
• Only during an inelastic collision
• Only if there is no net external force acting on the system
• Only if the system has zero momentum

Tags

NGSS.HS-PS2-2

Why are the dashboards in cars padded?

• They decrease the time of a collision.
• They increase the force of impact in a collision.
• They increase the time of impact in a collision.
• They make it look nice and feel good.

Tags

NGSS.HS-PS2-3