Elastic Encounters: Momentum and Energy

In an elastic collision, what is always conserved?

• Mass

• Momentum

• Volume

• Temperature

Tags

NGSS.HS-PS2-2

If two objects collide elastically and one is initially at rest, what can we say about their velocities after the collision in a one-dimensional scenario?

• Both objects will come to rest.

• The moving object will stop, and the stationary object will move with the velocity of the first.

• Both objects will move with half of the original velocity.

• It depends on the masses of the objects.

Tags

NGSS.HS-PS2-2

What happens to the total kinetic energy in a perfectly elastic collision?

• It increases.

• It decreases.

• It is converted into potential energy.

• It remains the same.

Tags

NGSS.HS-PS3-2

Two carts of equal mass collide elastically on a frictionless track. If one cart is initially at rest, what will happen after the collision?

• The moving cart will stop, and the stationary cart will move with the same speed.

• Both carts will move together at half the original speed.

• The moving cart will continue with the same speed, and the stationary cart will remain at rest.

• The carts will bounce off each other with the same speed in opposite directions.

Tags

NGSS.HS-PS2-2

In an elastic collision, if the total kinetic energy is conserved, which of the following statements is true?

• The objects must have the same mass.

• The collision must be head-on.

• The objects must be made of the same material.

• None of the above.

What is the formula for calculating the conservation of momentum in a two-object system?

• m1v1 + m2v2 = m1v1' + m2v2'

• m1v1 - m2v2 = m1v1' - m2v2'

• m1v1^2 + m2v2^2 = m1v1'^2 + m2v2'^2

• m1 + m2 = m1' + m2'

Tags

NGSS.HS-PS2-2

Which of the following is a real-world example of an almost perfectly elastic collision?

• A car crash

• A football being kicked

• Two billiard balls hitting each other

• A snowball hitting a tree

Tags

NGSS.HS-PS2-2

What does an elastic collision between two objects imply about the forces between them during the collision?

• The forces are non-conservative.

• The forces cause permanent deformations.

• The forces are conservative.

• There are no forces between the objects.

Tags

NGSS.HS-PS2-2

NGSS.HS-PS2-3

If Object A with a mass of 2 kg moving at 3 m/s collides elastically with Object B with a mass of 3 kg at rest, what is the velocity of Object A after the collision assuming a one-dimensional collision?

• 1 m/s in the same direction

• 1 m/s in the opposite direction

• 3 m/s in the same direction

• 3 m/s in the opposite direction

Tags

NGSS.HS-PS2-2

When two objects collide elastically, which of the following is true about the relative speed before and after the collision?

• The relative speed increases after the collision.

• The relative speed decreases after the collision.

• The relative speed is zero after the collision.

• The relative speed is the same before and after the collision.

Tags

NGSS.HS-PS2-2