Momentum and impulse

Answer Key - Grade 11 Science Worksheet - Building Confidence

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

1. 1.

   What is the momentum of a 2 kg object moving at 3 m/s, Ari?

   6 kg·m/s
2. 2.

   What is the momentum of a 4 kg object moving at 2.5 m/s, Bo?

   10 kg·m/s
3. 3.

   What is the momentum of a 0.15 kg object moving at 20 m/s, Esme?

   3 kg·m/s
5. 4.

   In the momentum bar chart, which cart has more momentum, Jun?

   • They are equal
   • Cart B, since it is faster
   • Cart A
6. 5.

   In the momentum bar chart, where does cart A's 6 kg·m/s come from, Kira?

   Use the picture in question 4.

   • 2 kg + 3 m/s + 1
   • 2 kg × 3 m/s
   • 3 m/s × 3 s
7. 6.

   In the momentum bar chart, if cart B moved west at 4 m/s instead, what would its bar show, Luz?

   Use the picture in question 4.

   • −4 kg·m/s, below zero
   • +4 kg·m/s, the same as now
   • 0 kg·m/s
8. 7.

   Which has more momentum: a 1 kg cart at 10 m/s, or a 5 kg cart at 1 m/s, Milo?

   • The 5 kg cart, since it is heavier
   • They are equal
   • The 1 kg cart
9. 8.

   How do the momenta of a 3 kg cart at 2 m/s and a 1 kg cart at 6 m/s compare, Noah?

   • The 1 kg cart's is bigger, since it is faster
   • They are equal
   • The 3 kg cart's is bigger
10. 9.

    The same cart is stopped by a foam bumper or by a wooden block. Which gives the smaller average force, Ren?

    • The foam bumper
    • The wooden block
    • They are the same
11. 10.

    What does an impulse do to an object, Tala?

    • Changes its momentum
    • Changes its mass
    • Keeps its momentum fixed