Junior high school physics knowledge classified
A, acoustic
1. The generation and propagation of sound: sound is how to produce and spread, the speed of sound, echo, ear to listen to sound, stereo, the process of effect of my ears.
2. The sound of three characteristics: pitch, loudness, sound
3. The harm of noise and control
4. The use of sound: including ultrasound and infrasound, sound energy and information, voice and sound, sound and music, and architecture
Second, the optical
1. The light straight line dissemination
2. The reflection of light - the law of reflection and two types of reflection
3. The reflection of light, flat mirror imaging
4. The refraction of light - the law of refraction
5. The refraction of light - the role of convex and concave mirror
6. The refraction of light - convex lens imaging: camera, projector, magnifying glass, and eyes, glasses, the structure principle of microscopes and telescopes
7. Dispersion of light
8. Invisible light
9. Construction of reflection and refraction of light
Three, thermal
1. The temperature with a thermometer
2. - six types of state changes
3. The change of state - crystalline and amorphous
4. Molecular motion theory
5. Internal energy, internal energy, the relationship between internal energy and temperature, change the concept of object internal energy of the two ways
The heat capacity 6.
Calculation of heat 7.
8. Heat engine, steam engine, the internal combustion engine (gasoline engine and diesel engine), the efficiency of heat engine, the combustion value
Four, mechanical
1. The length, time, and its measurement:
2. Mechanical movement - reference
3. The mechanical movement speed
4. Quality and density: quality and density measurement, density characteristics and applications
5. Cognition - force and force measurement: force, force of the definition of a unit, the action of force effect, the force of the three elements, the use of spring dynamometer.
6. Cognition - gravity
7. Know force, friction force
8. Cognition - force diagrams and schematics
The synthesis of force of 9.
More than 10. The balance of forces: the force balance, second force balance condition
11. The force and motion, Newton's first law
12. -- inertial force and movement
Concept: 13. Stress and pressure stress and pressure, the pressure calculation, how to increase and decrease the pressure.
14. The liquid pressure: P = rho gh
15. Atmospheric pressure, atmospheric pressure, torricelli experiment, the change of atmospheric pressure, liquid boiling point, and the relationship between air pressure
16. Fluid pressure and velocity relationship
17. PASCAL's principle (or called "hard principle)
18. Buoyancy: concept, object conditions, the ups and downs of buoyancy Archimedes' principle
19. Simple machines -- -- leverage and lever balance condition
20. Simple machines, roller, pulley block
21. Simple machines -- -- levers and pulleys mapping
22. - cant simple machines
pulleys23. The two necessary factors of doing work
24. The principle of work
Power of 25.
26. The mechanical efficiency
27. Mechanical energy: factors determining the size of the kinetic energy and potential energy, kinetic energy and potential energy conversion and conservation of mechanical energy
Five, the electrical
1. The charge: the role of charge between the atomic structure, electroscope, and elementary charge
2. The triboelectrification
3. - the series-parallel circuit connection
4. The circuit, open circuit and short circuit
5. Current: current concepts, series-parallel circuit of current laws
6. Voltage: the concept, the law of the series-parallel circuit voltage
7. The resistance: the factors affecting the size of the resistance, the slide rheostat and resistance box, conductor and an insulator
8 ohm's law, current, voltage, resistance
9. Ohm's law - is calculated
Two table 10. Ohm's law - a change
11. Ohm's law - voltammetry measurement resistor
12. Electrical work
13. Electric heating: joule's law
14. The electrical
15. Life electricity - family circuit connection
16. Life electricity, electric shock and protection
Six, magnetism,
Magnetic phenomenon: 1., magnets, magnetic poles, magnetization, magnetic field

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