Mechanical work
Answers are for parents and teachers.
1
F = 40 N, s = 3 m. A (J)?
120
2
A 12 kg load is lifted 5 m uniformly (g = 10). A (J)?
600
3
A = 500 J, F = 100 N. s (m)?
5
4
Give one case where work is done and one where it is not.
Done: lifting a load; not done: pushing a wall (no displacement).
5
Why should you lift a heavy load by bending your knees, not your back (think)?
To protect your body from injury; get an adult’s help with heavy loads.