Electricity is not magic smoke in wires. It’s electrons moving together like a marching band.
Key concepts:
The 9th-grade physics curriculum in Lithuania focuses on fundamental classical physics, preparing students for more advanced topics in 10th grade. The main sections usually include: Fizika 9 Fizikos Vadovelis 9 Klasei.pdf
Find the half-life example in your PDF (e.g., Carbon-14: 5,730 years).
That means: if you had 1kg of C-14 today, in 5,730 years you’d have 0.5kg. In another 5,730 years – 0.25kg. It never reaches zero. Radioactive atoms are the ultimate procrastinators.
Waves don't carry stuff. They carry information and energy. That's how sound reaches you and light travels from the Sun. Electricity is not magic smoke in wires
Key concepts from your PDF:
The Tablecloth Trick (safe version):
Place a coin on a paper napkin on a table. Flick the napkin FAST horizontally. The coin stays put. You just demonstrated Newton's 1st Law (inertia) without reading 3 pages of theory. Waves don't carry stuff
The textbook "Fizika 9: Fizikos vadovelis 9 klasei" is a standard educational resource used in Lithuanian secondary schools (basic education curriculum). It is designed for students aged 14–15, typically in the third year of their physics studies (following 7th and 8th-grade introductions).