PHYSICS CONNECTION
Resultant work changes kinetic energy
The total work done by the forces acting on an object equals its change in kinetic energy. Braking is a useful example: resistive forces reduce the kinetic energy.
Wresultant = ½mv² − ½mu²
Follow the reasoning
- Calculate initial and final kinetic energies.
- Include the work of every force that acts along the displacement.
- Relate the net work to the energy change.
OFFICIAL OCR QUESTIONS
Try it in a past paper 1
Open the question, then use its mark scheme to check your work.
Question 1
Use a car’s velocity–time graph to find braking force, distance and work.
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.
ORIGINAL PHYSICSUK QUESTIONS
Put the ideas to work
More practice is on its way
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Specification outcomes (4)
- 3.3.1(a) Define work done by a force and the unit joule.
- 3.3.1(b) Use W = F x cos θ for work done by a force.
- 3.3.1(c) State and apply the principle of conservation of energy.
- 3.3.2(a) Define and calculate kinetic energy, Ek = ½mv², and derive it from first principles.