| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Show according to the rules of the laws of statics, that the system is in balance with respect to forces.
Answer: System is in balance with respect to forces.