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

Independent variable

Is the one you change

Dependent variable

Is the one you measure

Name the independent and dependent variables for these investigations

Please!!!!

1) Does adding salt to pure water affect the temperature it boils at?

Independent variable =Dependent variable =

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

Dependent variable =

3) Does the amount of air affect the length of time the candle burns for?

Independent variable =

Dependent variable =

4) Does the size of a magnet affect its strength?

Independent variable =Dependent variable = 

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

6) Do the number of batteries affect the brightness of the bulb?

Independent variable =

Dependent variable =

Now try these! They need a bit more thought. 

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

8) Do plants grow faster with fertiliser?

Independent variable =

Dependent variable =

9) Does more salt dissolve as the temperature of the water goes up?

Independent variable =

Dependent variable =

10) Are there more prickles on longer holly leaves?

Independent variable =

Dependent variable =

Control variable

These are the ones you keep the same through out the experiment

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.