Edexcel IGCSE Physics Plot Two Variables
Practise Edexcel IGCSE Physics plotting two variables by choosing scales, labelling axes, plotting points and adding an appropriate best-fit curve.
- Syllabus
- Issue 4 (2024)
- Course
- Physics 4PH1
Exam points
- Choose sensible linear scales and label both axes with quantities and units.
- Plot all data points accurately to the nearest half square on the graph grid.
- Draw a smooth curve or suitable best-fit line after plotting the two variables.
4C Plot two variables question 1
A student uses this apparatus to investigate how the efficiency of an electric motor varies with its input voltage.
This is the student's method.
- connect the electric motor to a d.c. power supply and a joulemeter
- attach a 1.0 kg mass to the electric motor using a length of string
- set the voltage of the power supply to 10 V and switch on the power supply
- switch off the power supply when the mass has been lifted through a distance of 50 cm
- record the input energy to the motor from the joulemeter
- calculate the energy transferred to the gravitational store of the mass
- calculate the efficiency of the motor
The student repeats this process, setting the power supply to a different voltage each time.
The table shows the student's results.
Plot a graph of the motor efficiency on the y-axis against the power supply voltage on the x-axis.
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