P2 1

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  • Created by: Florence
  • Created on: 17-11-12 20:27

P2 1.1

  • Forces can:
    • change the shape of an object
    • make start moving
    • make it stop moving
    • change its speed
    • change the direction it moves in
  • Forces are measured in newtons (N)
  • When two objects interact
    • The force on one object - action force - is matched by an opposite force - reaction force - on the other object.
  • Resultant force - The overall force resulting from a combination of separate forces.
  • If the resultant force is zero it will either:
    • stay still (if it was stationary)
    • keep moving at the same speed in the same direction as before.
  • If the forces are unbalanced the object will move in the direction of the strongest force with the same force (N) as the difference between the forces.

P2 1.2

  • Forces can deform or change the shape of an object..
  • Some materials deform easily. 
  • In other materials we cannot see a change because the material hardly deforms or the change is so quick we do not see it.
  • Objects that are elastic can be pushed and pulled out of shape but will regain their original shape once released.
  • The spring constant
    • Force and extension equation - F = k X x
      • F - force - N
      • k - spring constant - n/m
      • x - extension - m

P2 1.3

  • Speed - how far something moves in a known time
    • speed equation - v = d ÷ t
      • v - speed - m/s
      • d - distance - m
      • t - time - s
  • Distance / Time graphs
    • the steeper the gradient the higher the speed.
  • Velocity - The speed of an object in a given direction.
  • Velocity / Time graphs
    • Area below


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