Numeracy in Science – Rearranging equations and formulae Equations and formulae are used in Physics, Chemistry and Biology. Sometimes you will need to.

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Presentation transcript:

Numeracy in Science – Rearranging equations and formulae Equations and formulae are used in Physics, Chemistry and Biology. Sometimes you will need to rearrange them to work something out. To rearrange them, you need to understand what they mean. The formula for calculating speed is shown on the right. What does it mean? Experiment to measure the speed of an object

Numeracy in Science – Rearranging equations and formulae You rearrange an equation when what you want to work out is not the subject. In the equation below, “power” is the subject. If I wanted to work out “voltage” or “current”, I would need to rearrange it. Experiment to measure the current in an electrical circuit and the voltage across resistors What calculation do you think you would need to do to work out the voltage? (Remember, dividing is the reverse of multiplying).

The formula for calculating speed is shown on the right. It can also be written as: Speed = distance ÷ time How could this be rearranged to calculate distance? Experiment to measure the speed of an object Numeracy in Science – Rearranging equations and formulae

The formula for calculating the pressure on a surface is shown on the right. It can also be written as: pressure = force ÷ area How could this be rearranged to calculate force? Numeracy in Science – Rearranging equations and formulae Experiment to examine the effect of applying a force over different areas

The formula for calculating density is shown on the right. It can also be written as: density = mass ÷ volume How could this be rearranged to calculate volume? Numeracy in Science – Rearranging equations and formulae Experiment to compare the densities of different liquids

Numeracy in Science – Rearranging equations and formulae Equations and formulae are used in Physics, Chemistry and Biology. Sometimes you will need to rearrange them to work something out. To rearrange them, you need to understand what they mean. The formula for calculating speed is shown on the right. What does it mean? Experiment to measure the speed of an object ANSWER

Numeracy in Science – Rearranging equations and formulae You rearrange an equation when what you want to work out is not the subject. In the equation below, “power” is the subject. If I wanted to work out “voltage” or “current”, I would need to rearrange it. Experiment to measure the current in an electrical circuit and the voltage across resistors What calculation do you think you would need to do to work out the voltage? (Remember, dividing is the reverse of multiplying). ANSWER

The formula for calculating speed is shown on the right. It can also be written as: Speed = distance ÷ time How could this be rearranged to calculate distance? Experiment to measure the speed of an object Numeracy in Science – Rearranging equations and formulae ANSWER

The formula for calculating the pressure on a surface is shown on the right. It can also be written as: pressure = force ÷ area How could this be rearranged to calculate force? Numeracy in Science – Rearranging equations and formulae Experiment to examine the effect of applying a force over different areas ANSWER

The formula for calculating density is shown on the right. It can also be written as: density = mass ÷ volume How could this be rearranged to calculate volume? Numeracy in Science – Rearranging equations and formulae Experiment to compare the densities of different liquids ANSWER