| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Define the oscillation time of the pendulum.
Answer: 2,5 s
Exercise 2.1 B
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Define the frequency of the pendulum.
Answer: 0,41 Hz
Exercise 2.1 C
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Study how the amplitude of the motion affects to the oscillation time.
Answer: Examining the vibrations, it is noticed that there is not much difference, even though the amplitude varies.
Exercise 2.1 D
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Investigate the effect of the pendulum length on the oscillation time. Present the results graphically and determine from the graphical representation of the pendulum length when the oscillation time is 1 sec.
Answer: 0,25 - 0,26 m
Exercise 2.1 E
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Investigate the oscillation time of a spring effected by different mass. Show the results graphically and determine from the graph of the mass when the oscillation time of the spring is 1 s.
Answer: 305 g - 320 g
Exercise 2.1 F
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
How much is the measured oscillation time different from the predicted time (in seconds and percentages) of the math pendulum?
Answer: −0,005 ?; −0,2 %
Exercise 2.2 A
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Define the value of the force constant k of the spring.
Answer: $13\ N/m$
Exercise 2.2 B
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Specify the value of the force constant k of the spring.
Tip 1: The oscillation time of a spring can be determined from the equation $T=2\pi\sqrt{\frac{m}{k}}$
Tip 2: Place the observation values in the $(T^2,m)$ –coordinate system.
Tip 2: Place the observation values in the $(T^2,m)$ –coordinate system.
Answer: $12\ N/m$
Exercise 2.2 C
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Specify the value of the force constant k of the spring.
Answer: 12 N/m
Exercise 2.3 A
| Difficulty | Secondary School | High school/other |
| ★ | Basic | Easy |
| ★★ | Demanding | Basic |
| ★★★ | Demanding | |
| ★★★★ | Difficult | |
| ★★★★★ | Very difficult |
Determine the critical angle of the total reflection.
Answer: Approximately 42,5°
