Work: when a force does work

Answer Key - Grade 11 Science Worksheet - Building Confidence

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

1. 1.

   A 20 N push moves a cart 3 m in the direction of the push. How much work does the push do, Ari?

   60 J
2. 2.

   A 12.5 N push moves a cart 8 m in the direction of the push. How much work does the push do, Bo?

   100 J
3. 3.

   A 40 N push moves a cart 0.5 m in the direction of the push. How much work does the push do, Esme?

   20 J

4. Read this first

   Use this

   Energy bar chart (example data), one bar per energy store, height in J. Before the push: kinetic 0 J. After the push: kinetic 60 J. A transfer arrow goes from the push to the cart, labeled work 60 J. A 20 N push acts over 3 m on a cart on a smooth, level track.

5. 4.

   In the energy bar chart, how much work does the push do on the cart, Jun?

   • 60 J
   • 0 J
   • 23 J
6. 5.

   In the energy bar chart, which energy store grew because of the work, Kira?

   • Thermal energy
   • Gravitational energy
   • Kinetic energy
7. 6.

   In the energy bar chart, if the same push acted over 6 m instead, how much work would it do, Luz?

   • 120 J
   • 60 J
   • 30 J
8. 7.

   A drone carries a box level across a room at a steady speed. Does the drone's upward pull do work on the box, Milo?

   • Yes: the box is moving
   • No: the box doesn't move up or down
   • Yes: it holds the box up
9. 8.

   A cart pushes hard against a heavy crate that doesn't move. How much work does the push do on the crate, Noah?

   • 0 J
   • It depends on the time
   • A lot, since the push is hard
10. 9.

    A drone lifts a box straight up 1 m. Does the drone's pull do work on the box, Pia?

    • No: lifting isn't work
    • Yes: the box moves along the pull
    • No: the box ends at rest
11. 10.

    A ball drops from a hovering drone. What kind of work does gravity do on it, Tala?

    • Positive work
    • No work
    • Negative work