Working scientifically

What is a control variable?

• the variable that you change or select the values for

• the variable that you measure or observe to get your results

• a variable that must remain the same throughout an investigation

A student is investigating if salt is more soluble than sugar in 100 ml water at 20 °C.

In this investigation, what type of variable is the volume of water (100 ml)?

• independent variable

• dependent variable

• control variable

A student is investigating how the height of the ramp affects the distance from the ramp that a marble travels. Select two control variables for this investigation.

• distance from the ramp that a marble travels

• mass of the marble

• height of the ramp

• surface material of the ramp

An independent variable is . . .

• the variable that you change or select the values for.

• a variable that must remain the same throughout an investigation.

• the variable that you measure or observe to get your results.

What is the dependent variable in an investigation?

• the variable that you measure or observe to get your results

• a variable that must remain the same throughout an investigation

• the variable that you change or select the values for

What is the dependent variable in this investigation?

• length of the wire

• resistance of the wire

• material of the wire

What is the dependent variable in this investigation?

• force applied to the spring

• extension of the spring

What is a hypothesis?

• information gathered by your senses

• what you think the outcome of an investigation will be

• a scientific idea that you can test

What is a hazard?

• how likely something is to be harmful

• something that presents possible danger

• an action taken to remove or reduce exposure to

• something that could be dangerous

What is a risk?

• how likely something is to be harmful

• something that presents possible danger

• an action taken to remove or reduce exposure to a hazard