Units keep motion calculations consistent
Converting distances and times before calculating prevents errors in speeds, accelerations and graph areas. Units also reveal whether an equation could be valid.
Follow the reasoning
- Convert all distances and times to one consistent unit system.
- Use axis multipliers when reading a graph.
- Check that every term added in an equation has the same units.
Try it in a past paper 6
Open the question, then use its mark scheme to check your work.
Question 9
Interpret the giga prefix in a material’s modulus.
Build the supporting skills. Practise SI units before exploring this connection. This question has not been checked as a combined example of the connection.
Question 16
Use a bouncing ball’s velocity–time graph to find the largest momentum-change rate.
Build the supporting skills. Practise Kinematics before exploring this connection. This question has not been checked as a combined example of the connection.
Question 1
Find train deceleration and stopping distance, then evaluate the motion model.
Build the supporting skills. Practise Kinematics before exploring this connection. This question has not been checked as a combined example of the connection.
Question 3(a)
Compare the direction and speed of charge carriers moving through filter paper.
Build the supporting skills. Practise Kinematics before exploring this connection. This question has not been checked as a combined example of the connection.
Show 2 more paper references
Question 1
Identify an SI base unit.
Build the supporting skills. Practise SI units before exploring this connection. This question has not been checked as a combined example of the connection.
Question 8
Describe electron diffraction and compare the de Broglie wavelengths of electrons and a car.
Build the supporting skills. Practise SI units before exploring this connection. This question has not been checked as a combined example of the connection.
A curated collection checked against the question papers and mark schemes; not a complete past-paper catalogue. Links open official OCR PDFs in a new tab.
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Specification outcomes (5)
- 2.1.2(b) Derived units of S.I. base units, such as momentum (kg m s⁻¹) and density (kg m⁻³).
- 2.1.2(d) Check the homogeneity of physical equations using S.I. base units.
- 2.1.2(e) Use prefixes and their symbols to indicate decimal submultiples or multiples of units (pico, nano, micro, milli, centi, deci, kilo, mega, giga, tera).
- 3.1.1(a) Define and use displacement, instantaneous speed, average speed, velocity and acceleration.
- 3.1.1(d) Use velocity–time graphs to determine acceleration as the gradient and displacement as the area under the graph, including estimation for non-linear graphs.