Edexcel IGCSE Physics Graph Skills
Practise Edexcel IGCSE Physics graph skills by plotting data, choosing scales, drawing best-fit curves and interpreting graph relationships.
- Syllabus
- Issue 4 (2024)
- Course
- Physics 4PH1
Exam points
- Plot two-variable data with sensible linear scales, labelled axes and accurate points.
- Draw smooth curves or lines of best fit with points distributed appropriately around them.
- Read values and describe relationships from graphs, including continuous data and non-linear trends.
Covered syllabus points
4 Graphs 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.
Question (a)
(a)
The table shows the student's results.
[ 4 ]
Question (i)
(i)
Plot a graph of the motor efficiency on the y-axis against the power supply voltage on the x-axis.
[ 3 ]
Question (ii)
(ii)
Using the graph, determine the minimum power supply voltage that will allow the electric motor to operate at maximum efficiency.
voltage = ............ V
[ 1 ]
4 Graphs question 2
This question is about magnetism.
Question (a)
(a)
A student investigates how the length, L , of a current-carrying wire in a magnetic field affects the size of the force on the wire.
The student uses a power supply and keeps the current in the wire constant.
They use the same magnet throughout the experiment.
Diagram 2 shows part of the student's equipment.
[ 4 ]
Question (i)
(i)
Table 2 shows the student's results.
Table 2
Plot a graph of the results on the grid.
[ 3 ]
Question (ii)
(ii)
Draw a line of best fit.
[ 1 ]
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