# Y10: Variables Revision

Y10: Variables Revision
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Slide 1: Tekstslide
ScienceLower Secondary (Key Stage 3)

In deze les zitten 28 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

Y10: Variables Revision

For example:
• Colour
• Breed
• Mass

#### Slide 2 -Tekstslide

In science, our variables must be specific.

We never use the word amount. Instead we talk about volume, mass, concentration or density.
For example, if I drank some of the water in this glass, I would be decreasing the volume of water.

#### Slide 5 -Open vraag

Within a scientific investigation, there are many variables which could be changed.

It is important to identify them, as they could have an effect on the outcome of the experiment.

To be sure our results are valid, we can only change one variable at a time. All the rest must be controlled.

#### Slide 7 -Tekstslide

What is the independent variable here?

A study was done to find if different tire treads affect the braking distance of a car.

#### Slide 8 -Open vraag

What is the independent variable here?

The time it takes to run a mile depends on the person’s running speed.

#### Slide 9 -Open vraag

What is the independent variable here?

The height of bean plants depends on the amount of water they receive.

#### Slide 11 -Tekstslide

What is the dependent variable here?

A study was done to find if different tire treads affect the braking distance of a car.

#### Slide 12 -Open vraag

What is the dependent variable here?

The time it takes to run a mile depends on the person’s running speed.

#### Slide 13 -Open vraag

What is the dependent variable here?

The height of bean plants depends on the amount of water they receive.

#### Slide 15 -Tekstslide

What variables would need to be controlled?

A study was done to find if different tire treads affect the braking distance of a car.

#### Slide 16 -Open vraag

What variables would need to be controlled?

The time it takes to run a mile depends on the person’s running speed.

#### Slide 17 -Open vraag

What variables would need to be controlled?

The height of bean plants depends on the amount of water they receive.

#### Slide 18 -Open vraag

Match the keyword to the definition.
The variable that an investigator changes.
The variable that an investigator measures.
The variables that are kept the same so the results are reliable.
Independent variable
Dependent variable
Control variable

#### Slide 19 -Sleepvraag

Identify the independent and dependent variables.

The higher the temperature of the air in the oven, the faster a cake will bake.

#### Slide 20 -Open vraag

What variables would need to be controlled?

The higher the temperature of the air in the oven, the faster a cake will bake.

#### Slide 21 -Open vraag

Identify the independent and dependent variables.

Lemon trees receiving the most water produced the most lemons.

#### Slide 22 -Open vraag

What variables would need to be controlled?

Lemon trees receiving the most water produced the most lemons.

#### Slide 23 -Open vraag

Identify the independent and dependent variables.

An investigation found that more bushels of potatoes were produced when the soil was fertilised more.

#### Slide 24 -Open vraag

What variables would need to be controlled?

An investigation found that more bushels of potatoes were produced when the soil was fertilised more.

#### Slide 25 -Open vraag

Identify the independent and dependent variables.

Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied.

#### Slide 26 -Open vraag

What variables would need to be controlled?

Students measured the temperature of the water at different depths in Lake Skywalker and found that the temperature varied.

#### Slide 27 -Open vraag

Go and get a copy of the worksheet from the front and complete it.