Momentum and impulse

Answer Key - Grade 11 Science Worksheet

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

1. 1.

   A bumper pushes on a cart with an average force of 200 N for 0.05 s. What impulse does it give, Ari?

   10 N·s
2. 2.

   A bumper pushes on a cart with an average force of 50 N for 0.4 s. What impulse does it give, Bo?

   20 N·s
3. 3.

   A bumper pushes on a ball with an average force of 1200 N for 0.01 s. What impulse does it give, Esme?

   12 N·s
5. 4.

   In the momentum bar chart, what is the cart's change in momentum, Jun?

   • −12 kg·m/s
   • +6 kg·m/s
   • −6 kg·m/s
   • 0 kg·m/s
6. 5.

   In the momentum bar chart, what impulse does the foam bumper give the cart, Kira?

   Use the picture in question 4.

   • 0 N·s
   • 2 N·s, west
   • 6 N·s, east
   • 6 N·s, west
7. 6.

   In the momentum bar chart, the stop takes 0.3 s. What is the average force on the cart, Luz?

   Use the picture in question 4.

   • 6 N
   • 2 N
   • 1.8 N
   • 20 N
9. 7.

   In the force-time graph, what impulse does the launcher give the ball, Noah?

   • 20 N·s
   • 8000 N·s
   • 400 N·s
   • 10 N·s
10. 8.

    In the force-time graph, the launcher's 10 N·s is compared with a steady 20 N push for 0.5 s. Which impulse is bigger, Pia?

    Use the picture in question 7.

    • Impulses can't be compared
    • Neither; both are 10 N·s
    • The steady push, since it lasts longer
    • The launcher's, since 400 N is bigger
11. 9.

    To stop the same cart with half the average force, what must happen to the stopping time, Tala?

    • It stays the same
    • It must double
    • It must halve
    • It must quadruple
12. 10.

    A cart either stops at a bumper or bounces straight back at the same speed. Which needs the bigger impulse, Zee?

    • The stop
    • The bounce
    • They need the same impulse
    • Neither needs an impulse