Work: when a force does work
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Squeezing a spring launcher, the force rises steadily from 0 to 40 N over 0.5 m. How much work is done, Ari?
Squeezing a spring launcher, the force rises steadily from 0 to 120 N over 0.25 m. How much work is done, Esme?
In the energy bar chart, how much kinetic energy does the box have after, Jun?
- 100 J
- 130 J
- 30 J
- 70 J
In the energy bar chart, what is the net work done on the box, Kira?
Use the picture in question 3.
- 100 J
- 130 J, adding both
- −30 J
- 70 J
In the energy bar chart, where did the 30 J taken by friction go, Luz?
Use the picture in question 3.
- Into gravitational energy
- Into the box's kinetic energy
- It was destroyed
- Into thermal energy, warming the floor and box
Milo says a drone hovering while holding a box does work on the box. Agree or disagree?
- Disagree: the box doesn't move
- Agree: the upward part is F sin θ
- Agree: any force does work
- Agree: work can't be negative, so it must be positive
Noah says friction does positive work on a sliding box. Agree or disagree?
- Agree: use F sin θ for friction
- Agree: any force does work
- Agree: work is positive for any force
- Disagree: friction does negative work
Pia says a slanted pull's work uses F cos θ, with θ between the pull and the motion. Agree or disagree?
- Agree: cos θ gives the part along the motion
- Disagree: slanted pulls do positive work for any angle
- Disagree: work uses F sin θ
- Disagree: any force does full work
With no friction, how does the work to push a box up a ramp compare with lifting it straight to the same height, Ren?
- It is the same
- Lifting takes no work
- The ramp takes more work
- The ramp takes less work
Why does a ramp make it easier to raise a box, Tala?
- It makes the box lighter
- It needs less work
- It removes gravity
- It needs less force, over a longer distance