Quiz about Conservation of Momentum

Question 1

Which of the following is NOT a unit of momentum?

Accepted Answer

kg*m/s2

Answer

kg*m/s

Answer

N*s

Answer

kg*mph

Question 2

What is the total momentum before the collision?

Accepted Answer

-3000 kg*m/s

Answer

+13000 kg*m/s

Answer

-13000 kg*m/s

Answer

+3000 kg*m/s

Question 3

When a rocket lifts off, its upward momentum is matched by the downward momentum of _____.

Accepted Answer

hot gases expelled by the rocket

Answer

nothing

Answer

air pushed out of the way by the rocket

Answer

the launch pad

Question 4

A billiard ball rolls to the right and hits a stationary billiard ball. What direction is the total momentum of the system after they hit?

Accepted Answer

Right

Answer

Neither

Answer

There's no way to know

Answer

Left

Question 5

While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball's velocity was 10 m/s and the 8 ball was at rest. If both ball's have a mass of 0.15 kg and the cue ball's velocity after the collision is 2 m/s, what is the 8 ball's velocity?

Accepted Answer

8 m/s

Answer

2 m/s

Answer

-2 m/s

Answer

1.5 m/s

Question 6

In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other. The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s. The carts stick together when they collide. Calculate their final speed.

Accepted Answer

0.5 m/s

Answer

1.0 m/s

Answer

0.33 m/s

Answer

0.67 m/s

Question 7

An 1 kg object moving to the right at 2 m/s collides inelastically with a 1 kg object moving to the left at 2 m/s. The final velocity of both objects will be

Accepted Answer

0 m/s

Answer

1 m/s

Answer

2 m/s

Answer

4 m/s

Question 8

A large box slides across a frictionless surface with a velocity of 12 m/s and a mass of 4 kg, collides with a smaller box with a mass of 2 kg that is stationary. The boxes stick together. What is the velocity of the two combined masses after collision?

Accepted Answer

8 m/s

Answer

0 m/s

Answer

4 m/s

Answer

12 m/s

Question 9

The total momentum before a collision is _________ the total momentum after a collision.

Accepted Answer

equal to

Answer

less than

Answer

more than

Answer

It depends on the type of collision

Question 10

A 120 kg lineman moving at -2 m/s tackles an 80 kg fullback moving at +8 m/s. If the fullback's velocity after they collide is +2 m/s, what is the lineman's velocity?

Accepted Answer

2 m/s

Answer

8.7 m/s

Answer

4.7 m/s

Answer

6 m/s

Question 11

Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:

Accepted Answer

2 m/s

Answer

3.4 m/s

Answer

4.6 m/s

Answer

7.1 m/s

Question 12

Conservation of Momentum

Accepted Answer

The total momentum of a closed system remains constant unless acted upon by an external force.

Answer

The total momentum of a closed system can change if the internal forces are strong enough.

Answer

Momentum is always conserved in any type of collision, regardless of external forces.

Answer

Momentum is only conserved in elastic collisions.

Question 13

Conservation of Momentum

Accepted Answer

The car's momentum is transferred to the Earth, causing a negligible change in the Earth's motion.

Answer

The momentum of the car is transferred to the wall, causing the wall to move.

Answer

The car's momentum is lost as heat and sound energy.

Answer

The car's momentum is conserved within the car itself.

Question 14

Conservation of Momentum

Accepted Answer

The total momentum of the system is zero before and after the collision.

Answer

The total momentum of the system is greater after the collision.

Answer

The total momentum of the system is less after the collision.

Answer

The total momentum of the system is only conserved if the collision is elastic.

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