Potential energy
Answers are for parents and teachers.
1
m = 10 kg, h = 3 m (g = 10). E_p (J)?
300
2
E_p = 1000 J, m = 20 kg, g = 10. h (m)?
5
3
A book on a table: E_p = 0 relative to the table. What is E_p relative to the floor (m = 0.5 kg, table 0.8 m, g = 10)?
4 J
4
Why can water behind a dam turn a turbine?
The water’s potential energy turns into work as it falls.
5
Why is it dangerous to leave stones or bricks high up?
If they fall, their potential energy can do large harm.