Who am I?

FUNCAU!

Formula FrenzyAtoms and Matter Lesson 3

Learning Intention To learn to recognise and manipulate

formulas

Using Symbols When quantities are put into formulas as

unknowns we give them a symbol. We use the same symbol to keep track of what we are doing.

Some are easier to remember than others…

quantity symbol

Distance dTime tSpeed vDisplacement sVelocity vacceleration a

quantity symbol

Charge

Current

Voltage

Power

quantity symbol

Charge QCurrent I

Voltage VPower P

In formulas we replace the quantity with the symbol

quantity symbol

Distance dTime tSpeed vDisplacement sVelocity vacceleration a

d

v x t

formulas

quantity symbol

Distance dTime tSpeed vDisplacement sVelocity vacceleration aInitial velocity uFinal velocity v

d

v x t

formulas

The symbol Δ (delta) means “change of”

In these formulas a is the subject

Worked example

1. If a sprinter reaches 12 m/s in 3 seconds what is his acceleration?

V=12m/sU=0 m/st= 3 sa = ? a= 12 – 0

3a = 4 m/s/s = 4 m/s2

What about me?

For Formula Questions always follow FUNCAU

F – write formulaU – write down the

unitsN – sub in the numbersC – do the calculationsA- write answerU – add the units

FormulasLets change the subject

What techniques

and skills do I need?

• To “read” it. These are not just numbers they mean something.

• What techniques can we use to “read” it?

FormulasLets change the subject

What techniques

and skills do I need?

• Understand order of operations

• BODMAS• BOMDAS• BEDMAS• WHATEVER

FormulasLets change the subject to u

A car is travelling at 10m/s and increases to 20m/s in 4 seconds what is it’s acceleration?

If that acceleration continues what will it’s speed be 3 seconds later?

UseE=mcΔT

to work out the energy required to raise the temperature of 2kg of water by 10oC.Cwater = 4200 J/kgoCHow much water could you boil if you used 10kJ?