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Investigating friction variables

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Contents

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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

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1

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

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

Click to reveal the definition of a variable.

What are variables?

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2

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.

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The distance the object travels.

The roughness of the surface.

Click the post it notes to reveal the variables.

Identifying variables

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3

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

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What variable could you measure?

What variable do you need to change?

Our experiment

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4

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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.

The distance the car travels.

The material.

Click the post it notes to reveal the variables.

Identifying variables

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5

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

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What variable could you measure?

What variable do you need to change?

Click to reveal if the variable needs to be controlled.

Controlling variables

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6

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No - this variable cannot be controlled.

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.

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.

No - this variable cannot be controlled.

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

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.

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