| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
a) How many percents of the bodys potential energy transforms to heat energy during the sliding? b) Specify the coefficient of the sliding friction.
Tip 1: Measure time and velocity at specific distance.
Tip 2: The principle of energy $E_{beginning}=E_{end}$ or the model of steady accelerating movement.
Tip 2: The principle of energy $E_{beginning}=E_{end}$ or the model of steady accelerating movement.
Answer: a) 95 % - 96 %; b) 0,22 – 0,24