Work: when a force does work

Answer Key - Grade 11 Science Worksheet

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

1. 1.

   Ari pulls a wagon 4 m along level ground with 50 N at 60° above the ground. To the nearest tenth, how much work does the pull do?

   100 J
2. 2.

   Bo pulls a wagon 10 m along level ground with 30 N at 37° above the ground. To the nearest tenth, how much work does the pull do?

   239.6 J
3. 3.

   Esme pulls a wagon 6 m along level ground with 25 N at 30° above the ground. To the nearest tenth, how much work does the pull do?

   129.9 J
4. 4.

   A pull acts at 60° above level ground on a sliding wagon. Which part of the pull does work, Jun?

   • The whole pull
   • No part of it
   • F cos 60°, along the ground
   • F sin 60°, the upward part
5. 5.

   A force acts at 90° to an object's motion. How much work does it do, Kira?

   • Negative F × d
   • Half of F × d
   • None
   • All of F × d
6. 6.

   In the force-displacement graph, how much work does the push do, Milo?

   • 40 J
   • 80 J
   • 5 J
   • 24 J
7. 7.

   In the force-displacement graph, how much work does the push do over the 4 m, Pia?

   • 40 J
   • 160 J
   • 120 J
   • 80 J
8. 8.

   A drone lifts a 2 kg box 1.5 m straight up at a steady speed. With g = 9.8 m/s², how much work does the drone's pull do, Ren?

   • 3 J
   • 29.4 J
   • 19.6 J
   • 0 J, since the speed is steady
9. 9.

   During that same lift, how much work does gravity do on the box, Tala?

   • −3 J
   • 0 J
   • −29.4 J
   • +29.4 J
10. 10.

    The drone then lowers the same box 1.5 m at a steady speed. How much work does gravity do on it, Zee?

    • 0 J
    • +29.4 J
    • −29.4 J
    • +58.8 J