Physics particle model 1

• Particles are held together by forces
• Particles


  • They are held closely together in a fixed and rigid arrangement
  • They can move around freely and collide with other particles
• The pressure of the gas depends on the density of the particles and the speed of the particles
• Particles have kinetic energy
• Particles can have potential energy
• As temperature increases, the particles will gain more kinetic energy
• Measuring the density of an irregularly-shaped object

  1. Use the displacement method

  2. Measure the volume of the water displaced by the object

  3. This gives the volume of the object

  4. Use the density formula to calculate density
• Liquids have weaker forces of attraction between particles
• Liquids can flow and move past each other
• Density


  A measure of how much mass there is in a given space
• A more dense material


  Will have more particles in the same volume when compared to a less dense material
• Gases have the weakest forces of attraction between particles
• Gases have the most energy and are free to move in random directions
• When a substance is heated, the particles gain kinetic energy
• When a substance changes state, the number of particles does not change
• Specific latent heat


  The amount of energy needed to change the state of a substance