Collection of questions and tasks in physics for grades 6-7 (1958)

The study of physics in high school begins when students have already received certain knowledge in mathematics and are able to operate with calculations of physical quantities. Also by this time, students already have an idea of ​​the phenomena of the world. The manual contains a number of original issues, tasks and experiments on mechanics, warmth and electricity.
Why is it easy to slip on a watermelon crust that fell under the leg? When does the bread stale faster - in a closed closet or on the table? Why does water extinguish the fire? Why is lightning able to ignite the tree?
Issues based on specific practical examples will help students better learn or expand their knowledge of the subject being studied. The publication also contains tables of physical quantities and answers and indications to the solutions of problems