Lesson 2 Two Variables

What is a VARIABLE? What do we mean by VALUES? What do we mean by RELATIONSHIP?

What are the variables, values and the relationship?

Variables Input variable (What we change.) Outcome variable (What we measure.)

Activities Read the instructions before you start the experiment.

Activity 1 The Pully Mass (g) Force needed to lift (N) Input – Outcome – Relationship –

Activity 1 The Pully Mass (g) Force needed to lift (N) Input – Mass Outcome – Force Relationship – Up - Up Thinking Back

Activity 2 Heights of a liquid Container letterDiameter of container (cm)Depth of water (cm) Input – Outcome – Relationship -

Activity 2 Height of liquid Container letterDiameter of container (cm)Depth of water (cm) Input – Diameter Outcome – Height Relationship - Up -Down Thinking Back

Activity 3 Leaves FreshnessSurface which is covered Freshest Next freshest Nearly dry Driest Input – Outcome – Relationship –

Activity 3 Leaves FreshnessSurface which is covered Freshest Next freshest Nearly dry Driest Input – Side with vaseline Outcome – Dryness Relationship – Which side loses water. Thinking Back

Activity 4 Height and weight

Name Height (in order) Weight Susan14235 Lee14442 Clark14631 Veena14843 Robert14934 Sharon15138 Input – Outcome – Relationship - Thinking Back

Activity 4 Height and weight Name Height (in order) Weight Susan14235 Lee14442 Clark14631 Veena14843 Robert14934 Sharon15138 Input – Height Outcome – Weight Relationship - Non Thinking Back

Could you easily identify the inputs and outcome variables in each activity? Which ones were difficult? Why?

Did all the activities show relationships between variables? Which variables were related or linked together in activities 1, 2, 3 and 4?1234

Bridging. What other science activities have you done recently? What were the input and outcome variables? What sort of relationships were there?