Work: when a force does work
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
A 12.5 N push moves a cart 8 m in the direction of the push. How much work does the push do, Bo?
A 40 N push moves a cart 0.5 m in the direction of the push. How much work does the push do, Esme?
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.
In the energy bar chart, how much work does the push do on the cart, Jun?
- 60 J
- 0 J
- 23 J
In the energy bar chart, which energy store grew because of the work, Kira?
- Kinetic energy
- Gravitational energy
- Thermal energy
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
A cart pushes hard against a heavy crate that doesn't move. How much work does the push do on the crate, Noah?
- It depends on the time
- A lot, since the push is hard
- 0 J
A drone lifts a box straight up 1 m. Does the drone's pull do work on the box, Pia?
- No: the box ends at rest
- Yes: the box moves along the pull
- No: lifting isn't work
A box slides across the floor. What kind of work does friction do on it, Ren?
- No work
- Negative work
- Positive work, since friction is a force
A ball drops from a hovering drone. What kind of work does gravity do on it, Tala?
- Positive work
- No work
- Negative work
A cart rolls along a level track. What work does the track's upward normal force do on it, Zee?
- Zero work
- Negative work
- Positive work, since the force is real