Work: when a force does work
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
A 20 N push moves a cart 3 m in the direction of the push. How much work does the push do, Ari?
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
- 23 J
- 0 J
In the energy bar chart, which energy store grew because of the work, Kira?
- Kinetic energy
- Gravitational energy
- Thermal energy
In the energy bar chart, if the same push acted over 6 m instead, how much work would it do, Luz?
- 30 J
- 120 J
- 60 J
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?
- No: the box doesn't move up or down
- Yes: the box is moving
- 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?
- A lot, since the push is hard
- It depends on the time
- 0 J
A drone lifts a box straight up 1 m. Does the drone's pull do work on the box, Pia?
- Yes: the box moves along the pull
- No: the box ends at rest
- No: lifting isn't work
A box slides across the floor. What kind of work does friction do on it, Ren?
- Negative work
- No work
- Positive work, since friction is a force
A cart rolls along a level track. What work does the track's upward normal force do on it, Zee?
- Zero work
- Positive work, since the force is real
- Negative work
