Mechanical phenomena
The first section of the physics OGE: grade 7-9 topics based on Peryshkin's textbooks.
Subsections
Kinematics
Basic concepts, uniform and uniformly accelerated motion, free fall, motion in a circle.
Dynamics
Mass and density of a substance; force and the resultant of forces; Newton's laws; elastic force and Hooke's law; friction force; force of gravity, universal gravitation and weight.
Conservation laws
Momentum of a body, a closed system, the law of conservation of momentum, an inelastic collision, jet propulsion; mechanical work and power; kinetic and potential energy; the law of conservation of mechanical energy; simple machines and efficiency.
Pressure
Pressure of solids and liquids: the pascal, ways to change pressure, Pascal's law, the pressure ρgh, communicating vessels, the hydraulic press, atmospheric pressure and the barometer, Archimedes' law and the floating of bodies.
Vibrations and waves
Oscillatory motion, amplitude, period and frequency, free and forced oscillations, thread and spring pendulums, resonance; mechanical waves, wavelength and wave speed, sound and echo.