P4

• Newtons third law

  When two objects interact, the forces they exert on each other are equal and opposite
• When pushing against a wall, the wall pushes back with an equal and opposite force.

  This force is called normal contact force
• Newtons first law

  an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force
• newtons second law


  f=ma

  acceleration is directly proportional to force and inversely proportional to mass
• Internal energy is the total energy stored by the particles making up a substance or system.

  Which two stores is it comprised of? 

  kinetic

  potential
• Temperature is a measure of the average kinetic energy of the particles in a substance.

  The particles in a solid have kinetic energy because they are vibrating. The particles in a liquid or gas have kinetic energy because they move around.
• Specific heat capacity is the amount of energy required to raise the temperature of 1 kg of a substance by 1 °C.
• The specific latent heat is the energy required to change 1kg of a particular substance from one state to another, without a change in temperature.