One to two mark questions will start with command words such as 'describe' or 'explain'. Some command words are easy to understand such as:
The command words 'describe' and 'explain' can be confusing. If you are asked to describe a graph, you will be expected to write about its overall shape, whether it is linear or curved, the slope of gradients etc. If you are asked to explain why a pattern or trend is seen in a graph, you will be expected to use your science knowledge, not just say what you see (which is a description), eg 'The graph shows a steep linear increase for the first three hours because…'.
'Explain how' and 'why' questions often have the word 'because' in their answer. 'Describe' questions don't.
The number of marks per question part is given in this form: '[2 marks]'. It is essential that you give two different answers if a question is worth two marks. Sometimes you can gain a second mark by giving the units in a calculation or stating specific data points, eg 'The speed of the object decreased by 8 m/s.'
A firework rocket contains a solid fuel inside a cardboard tube.
The burning of the fuel creates a thrust to propel the rocket upwards.
Scientists can refer to several different quantities when describing the motion of the rocket.
Only one of these quantities is a vector.
Complete this sentence using one of the words from the box. [1 mark]
The vector quantity is: ______.
An Edexcel question courtesy of Pearson Education Ltd.