Don't forget to take a ruler and scientific calculator into the exam.
Maths questions often start with the command word 'calculate'. You need to use numbers given in the question to work out the answer.
When an answer to a maths question is marked:
Make sure you give answers to a suitable number of significant figures.
Maths questions might ask you to plot or complete a graph or table. When you draw a graph, make sure you:
You may be given a grid with axes labelled and scales already given. Sometimes you may be given an empty grid for you to supply your own axes. When you do this:
Take extra care when converting between units.
This page contains AQA material which is reproduced by permission of AQA.
a) The kinetic energy of a moving car depends on the car's mass and speed.
Write down the equation that links kinetic energy, mass and speed. [1 mark]
b) A car has a mass of 1,650 kg.
Calculate the kinetic energy of the car moving at 30 m/s.
Give your answer in kilojoules (kJ). [2 marks]
a) Kinetic energy = 0.5 × mass × speed2 
b) 0.5 × 1,650 × 302 
= 742500 J 
= 742.5 kJ 
A heater has a power rating of 2,500 W.
The heater is turned on for 180 seconds.
Calculate the energy transferred by the heater.
Use the equation:
energy transferred = power × time
Give your answer in kilojoules (kJ). [3 marks]
energy = 2,500 × 180 
= 450,000 
= 450 kJ 
A skater with a mass of 70 kg stands on the ice.
a) Write down the equation that links acceleration, change in velocity and time. [1 mark]
b) As the skater pushes away across the ice there is a small frictional force.
After pushing, the skater starts to move with a velocity of 5 m/s.
He slows to 3 m/s in 6 seconds.
Calculate the acceleration of the skater. [2 marks]
= -0.33 (m/s2 ) 
In an electrolysis cell the current is 1.5 × 105 A , at a potential difference of 4 V.
Calculate the energy transferred by the electrolysis cell in 24 hours. [5 marks]
power = 1.5 × 105 × 4 
= 6.0 × 105 
24 hours = 24 × 60 × 60 
= 8.64 × 104 seconds
energy transferred = 6.0 × 105 × 8.64 × 104 
5.184 × 1010 (J)