2. Learning Objectives
Know and understand what an Independent variable is
Know and understand what an Dependent variable is
Show each of these in different scenarios

3. Independent variable
Is the one you change

4. Dependent variable
Is the one you measure

5. Name the independent and dependent variables for these investigations
Please!!!!

6. 1) Does adding salt to pure water affect the
temperature it boils at?
Independent variable =
Dependent variable =

7. 2) Does the amount of light affect the
number of woodlice found?
Independent variable =
Dependent variable =

8. 3) Does the amount of air affect the
length of time the candle burns
for?
Independent variable =
Dependent variable =

9. 4) Does the size of a magnet affect its strength?
Independent variable =
Dependent variable =

10. 5) Does the colour of the filter affect the colour of the light?
Independent variable =
Dependent variable =

11. 6) Do the number of batteries affect the
brightness of the bulb?
Independent variable =
Dependent variable =

12. Now try these! They need a bit more thought.  

13. 7) Does hearing range decrease with age?
Independent variable =
Dependent variable =

14. 8) Do plants grow faster with fertiliser?
Independent variable =
Dependent variable =

15. 9) Does more salt dissolve as the
temperature of the water goes
up?
Independent variable =
Dependent variable =

16. 10) Are there more prickles on longer
holly leaves?
Independent variable =
Dependent variable =

17. Control variable
These are the ones you keep the same through out the experiment

18. Draw a circle
Write the dependent variable in the middle
List all the other variables that could make a difference to the dependent variable round the outside
Highlight and label the dependent variable, the independent variable and the controlled variables
Write a better title for the investigation.