Calculating speed (e.g., a tractor vs. a snail) and relative motion.
The book often suggests things you can do in your kitchen, like measuring the density of a potato or observing water surface tension with a needle. Why the 1994 Edition is Special Calculating speed (e
Problems on diffusion, the three states of matter, and thermal expansion. Why the 1994 Edition is Special Problems on
Many problems don't require a calculator. For example: "Why is it easier to pull a heavy sled once it has already started moving?" or "Why do bubbles in a glass of soda rise faster as they get closer to the surface?" . You might be asked to estimate the number
You might be asked to estimate the number of atoms in a drop of water or the volume of air in your own classroom.
Lukashik is famous for including problems that feel more like puzzles than schoolwork:
The 1994 edition of (Physics Problem Collection) for grades 7–8 is a classic of Soviet and post-Soviet education, valued for its focus on physical intuition over dry formulas.