Changing the way you learn

Physics

Energy Transfer
1. Types of Energy
  1. Chemical Kinectic Nuclear Electric Thermal Radient Sound Potential- Gravitational Elastic
2. Sankey Diagrams
  1. Total Energy input= Wasted energy+ Useful energy
  2. Wasted energy line goes down
  3. Useful energy line goes straight across
  4. efficiency= useful energy output/ total energy input
3. Conduction
  1. Heat energy is conducted from the hot end to the cold end by atoms bumping into each other
  2. Metals are good conductors
    1. have many free moving electrons
4. Convection
  1. Warmer, less dense liquid rises and hotter, more dense liquid falls causing a convection current
  2. Happens in liquids and gasses
  3. E.g in a room a radiator causes a convection current
5. Radiation
  1. When the heats hits an object some of it is absorbed and makes the molecules vibrate causing the object to heat up
  2. Matt Black is a good radiator
  3. Shiny silver is a bad radiator
6. Insulators
  1. Dont let heat through them
    1. Opposite to Conductors
Energy Resources and Generation
1. Fossil fuels
  1. Advantage: easy to obtain
  2. Disadvantage: pollution
  3. Non-renewable
2. Nuclear
  1. Advantage: does not produce CO2
  2. Disadvantage: dangerous product
  3. Non-renewable
3. Wind
  1. Advantage: renewable + non polluting
  2. Disadvantage: noisy, looks bad
4. Solar+tidal+wave
  1. Advantage: renewable+ non-pollluting
  2. Disadvantage: not when night or cloudy
5. Hydroelectric
  1. Advantage: Renewable+ Non-polluting
  2. Disadvantage: costly
6. Conversions
  1. FF= Chemical- Thermal- Kinetic- Electrical
  2. Nuc= Nuclear- Thermal- Kinetic- Electrical
  3. W+W+T= Kinetic - Electrical
  4. Solar= Light- Electrical
  5. Geo=Heat-Kinetic- Elecrtical
  6. Hydro= Gravitational Potential- Kinetic- Electrical
Density and Pressure
1. Density
  1. Equations
    1. Density= Mass/Volume
    2. Regular shapes: volume= l x w x h
    3. Liquids: mass liquid in cylinder - mass of cylinder
    4. Irregular shapes: difference in level of water after input of object
2. Pressure
  1. Equations:
    1. Pressure= Force/ Area
    2. Liquids: Pressure= Density x 10 or 9.8 x depth
  2. Pressure in Liquids acts in ALL directions
Change of State
1. Three states of matter
  1. Solids
  2. Liquids
  3. Gases
2. Brownian motion
  1. Seemingly random movement of particles suspended in a liquid or a gas. it is caused by the small molecules colliding into the other particles and because they are so light the particles twist and jerk
Electrical Charges
1. Metals= gd conductors Glass + Plastic= insulators some things can be rubbed together to create a charge
2. Charge attractions
  1. Like charges repel
  2. Opposite charges attract
  3. Charged and neutral attract
3. Electrostatic precipitators
  1. Smoke precipitators
  2. B+W photocopiers
  3. Spray painting
  4. Fueling aircraft and petrol stations
Waves
1. 2 Types
  1. Longditudinal
    1. Oscilation and energy are parallel to eachother
    2. e.g Sound
    3. Vibrates in same direction as length
  2. Transverse
    1. e.g Light
    2. Oscilation and energy are right angles to eachother
    3. Moves perpindicular
2. Details
  1. Amplitude= height
  2. Trough= bottom Peak= top
  3. Wavelength= distance between
  4. Frequency= no. waves
3. Equations
  1. Time= 1/ frequency
  2. Wave speed= frequency x wavelength

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	Created by Katherine Russell over 11 years ago