I'm Etalie, I'm currently studying for my AS levels and will (hopefully) be posting revision entries on psychology and sociology.
I previously uploaded posts on GCSE revision. If it helps you then great! But I'm not an expert on anything AT ALL so don't rely on everything I post.
(Also, I'm not taking credit for any of the pictures or info here, it's all off google images, notes from BBC bitesize and CGP revision guides, textbooks etc)

(NB - GCSE: italics in the science subjects are things that are only in paper 2!)

Tuesday, 1 April 2014

1 - FORCES AND MOTION 

Forces and friction - 
  • Gravity/weight - straight downwards 
  • Reaction force - from surface, usually straight upwards 
  • Electrostatic force - between 2 charged objects (direction depends on type of charge, eg: repel, attract etc) 
  • Thrust/push/pull - eg: due to engine or rocket speeding something up 
  • Drag/air resistance/friction - slowing object down 
  • Lift - eg: due to aeroplane wing 
  • Tension - eg: in rope or cable
 Friction - 
  • Opposes motion (unless in space)
  • To stay at a a steady speed, there needs to be a driving force to counteract friction
1. Static friction - between solid surfaces that are gripping 
2. Sliding friction - between solid surfaces that are sliding past eachother (lubricant between surfaces eg: oil/grease) 
3. Resistance/drag - can be reduced by making object streamlined, lowers top speed of an object (eg: parachute)
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