Want to make creations as awesome as this one?

## Transcript

www.kapowprimary.com

Investigating friction variables

www.kapowprimary.com

www.kapowprimary.com

Contents

www.kapowprimary.com

1

Investigation question

2

What are variables?

6

5

4

Identifying variables

Controlling variables

Our experiment

Identifying variables

3

Does the roughness of a surface affect the amount of friction produced?

Investigation question

www.kapowprimary.com

1

www.kapowprimary.com

In a comparative test the thing being changed belongs to a named category or group.

Click to reveal the definition of a variable.

What are variables?

www.kapowprimary.com

2

www.kapowprimary.com

When planning a comparative test, we need to consider the things we are going to change, measure and keep the same because these things can all affect our investigation. These things are called variables.

A variable is something that can change and cause an effect.

Click to reveal the variables.

Identifying variables

www.kapowprimary.com

3

www.kapowprimary.com

Does the roughness of a surface affect the amount of friction produced?

What variable could you measure?

What variable do you need to change?

The distance the object travels.

The roughness of the surface.

Our experiment

www.kapowprimary.com

4

www.kapowprimary.com

1. Place your first material on the ramp.
2. Place the toy car at the top of the ramp.
3. Release the car.
4. Measure how far the car travels.
5. Record your results in the table.
6. Repeat the test for each material and record the results.

Click to reveal the variables.

Identifying variables

www.kapowprimary.com

5

www.kapowprimary.com

Does the material on the ramp affect the distance the car travels?

What variable could you measure?

What variable do you need to change?

The distance the car travels.

The material.

Click to reveal if the variable needs to be controlled.

Controlling variables

www.kapowprimary.com

6

www.kapowprimary.com

No - this variable should not be kept the same as it is the one you are changing.

No - this variable should not be kept the same as it is the variable you are measuring.

No - this variable cannot be controlled.

No - this variable does not need to be kept the same as it does not have an effect on the distance the car travels.

Yes - this variable should be kept the same as it will affect how far the car travels.

Yes - this variable should be kept the same as it will affect how far the car travels.

Yes - this variable should be kept the same as it will affect how far the car travels.