yr9science

• Dependent variable


  The variable being changed and investigated
• Controlled variable


  Factors which are kept the same as they could affect the investigation
• Identifying variables


  1. Shade the independent variable in one colour

  2. Shade the dependent variable in another colour
• Percentage change


  Shows how much a factor has increased or decreased compared to the original
• Calculating percentage change


  Difference x 100 / Original
• Percentage change calculation


  • Potato chip: 21g at start, 2.7g after being placed in water

  Difference = 2.7 - 21 = -18.3

  Percentage change = -18.3 x 100 / 21 = -87.14%
• Factors to calculate percentage change

  • Difference
  • Original
  • Percentage change
• Percentage change shows how much a factor has increased or decreased compared to the original
• Percentage change calculation


  • Width: 84912 before, 1415 after

  Difference = 1415 - 84912 = -83497

  Percentage change = -83497 x 100 / 84912 = -98.33%