High School Physics Conservation of Momentum

In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other. The orange cart has a speed of 2 m/s and the blue cart has an unknown initial speed. The carts stick together when they collide and move at 0.5 m/s, in the same direction as the blue cart. Calculate the unknown initial speed of the blue cart.

• 3 m/s

• 1.0 m/s

• 4.5 m/s

• 2.33 m/s

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 in the same direction as before, what is the 8 ball's velocity?

• 2 m/s

• 8 m/s

• -2 m/s

• 1.5 m/s

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:

• 2 m/s

• 3.4 m/s

• 4.6 m/s

• 7.1 m/s

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

• 8 m/s, to the left

• 4 m/s, to the left

• 8 m/s, to the right

• 4 m/s, to the right

A 3,000 kg truck moving at 10 m/s to the right hits a 1,000 kg parked car (zero initial speed). The parked car moves off at 15 m/s, to the right. What is the velocity of the truck?

• 15 m/s, to the right

• 5 m/s, to the left

• 5 m/s, to the right

• 15 m/s, to the left

The Law of Conservation of Momentum states:

• The total momentum before a collision is equal to the total momentum after a collision.

• The total momentum before a collision is greater than the total momentum after a collision.

• The total momentum before a collision is less than the total momentum after a collision.

• The total momentum before a collision is not related to the total momentum after a collision.

Tags

NGSS.HS-PS2-2

If two objects collide or explode, they experience

• the same force for the same amount of time.

• different forces for the same amount of time.

• different forces for different amounts of time.

• the same force for different amounts of time.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum
• Skater 2 experiences a greater change in momentum
• Skater 1 has a greater velocity than Skater 2
• Skater 1 experiences a greater force

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg that was at rest. If the two bobs stick together, with what velocity will the two blobs move?

• 3.57 m/s

• 3.2 m/s

• 10.0 m/s

• 9.0 m/s

A 9 kg blob moving at 5 m/s to the right collides and sticks to a second blob with a mass of 5 kg moving at 2 m/s to the right. If the two bobs stick together, with what velocity will the two blobs move?

• 2.5 m/s

• 3.9 m/s

• 5 m/s

• 2 m/s