Physics

• Scalar quantities 


  Only have a magnitude (size)

  Do not have a direction
• Speed-time graphs

  At a constant speed the line will be horizontal

  At a constant acceleration the line will have a positive gradient

  At a constant deceleration the line will have a negative gradient
• Newton's 3rd Law


  Interaction pairs

  Set of 2 forces that are equal and opposite

  They act on 2 interacting objects
• Resultant force


  The resultant force is the sum of all of the forces acting on an object

  If the forces acting on an object are unbalanced it means that a resultant force is acting on the object.

  Newton's 2nd Law
• Newton's 1st Law 


  Velocity of an object will only change if a resultant force is acting on the object
• Inertia


  How difficult it is to change the object's motion due to its mass
• 1827, Robert Brown discovered that particles are constantly moving

  All particles move in random directions
• Specific heat capacity 


  The amount of energy needed to increase the temperature of one kilogram of the material by 1 degree Celcius
• Transverse waves 


  Causes particles to vibrate at right angles in the medium
• Longitudinal waves 


  Causes particles to vibrate in the same direction as the wave's motion