Home > Subjects > Physics > Level 2 > 2.1 Physical quantities > Key tips
- Subject: Physics
- AS: AS90252
- Level: 2
- Credits: 4
- Internal
Physics 2.1 Take measurements of physical quantities and analyse data graphically to determine a relationship
Key tips
- Follow the written instructions that will be given to you by your teacher.
- Ask lots of questions.
- Keep to the marking schedule given to you by your teacher.
- You must demonstrate the ability to measure at least three different physical quantities and use atleast three different types of measuring instruments.
- You need to justify each accuracy technique you have used, in a way that is specific to the situation: not just a general statement.
- Always give your measurements with a correct unit and to an appropriate number of significant figures.
- Before your assessment, make sure you can recognise from the shape of the graphs the four types of relationships (linear, square, inverse, and inverse square) as mentioned in the subject content.
- Give the mathematical relationship in terms of the actual variables, not ‘y’ and ‘x’.
- Never use the data tables to work out the gradient of your graphs. Always draw a line of best fit and show (on the graph) how you used points on the line to find the gradient.
- The units of the gradient are the units of the ‘y’ axis over the units of the ‘x’ axis. For example, a graph of distance against time-squared will have units m/s2 or ms-2.
