Conservation of momentum in collisions

Answer Key - Grade 11 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   East is positive. A 2 kg cart moves at 4 m/s and a 1 kg cart moves at -3 m/s. What is their total momentum, Ari?

   5 kg·m/s
2. 2.

   East is positive. A 3 kg cart moves at 2 m/s and a 2 kg cart moves at -1 m/s. What is their total momentum, Bo?

   4 kg·m/s
4. 3.

   In the momentum bar chart, what is the total momentum before the collision, Jun?

   • 10 kg·m/s
   • 6 kg·m/s
   • 0 kg·m/s
5. 4.

   In the momentum bar chart, what is cart A's momentum after the collision, Kira?

   Use the picture in question 3.

   • 2 kg·m/s
   • 6 kg·m/s, as before
   • 10 kg·m/s
6. 5.

   In the momentum bar chart, what is the total momentum after the collision, Luz?

   Use the picture in question 3.

   • 6 kg·m/s
   • 0 kg·m/s
   • 4 kg·m/s, cart B's alone
7. 6.

   Two carts collide on a smooth, level track. Which quantity stays the same, Milo?

   • Each cart's speed
   • Their total speed
   • Their total momentum
8. 7.

   Two carts collide and stick together. Is momentum conserved, Noah?

   • No, because one cart stops
   • Yes; momentum still adds up the same
   • No, because they stick
9. 8.

   When might two carts' total momentum change during a collision, Pia?

   • When an outside force like rug friction acts
   • At no time; it can't change
   • When the carts stick together
10. 9.

    East is positive. A 1 kg cart moves west at 5 m/s. What is its momentum, Tala?

    • +5 kg·m/s
    • −5 kg·m/s
    • 0 kg·m/s
11. 10.

    A 2 kg cart at 2 m/s east and a 1 kg cart at 4 m/s west collide. What is the total momentum after, Zee?

    • 0 kg·m/s
    • 4 kg·m/s
    • 8 kg·m/s