WJEC A Level Physics
WJEC A Level Physics 1.4 Energy Concepts Exam Questions
Free WJEC A Level Physics exam questions on 1.4 Energy Concepts, with mark schemes. Covers work, kinetic and potential energy, power, efficiency and conservation of energy.
1.4 Energy Concepts exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
A Level Physics Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About WJEC A Level Physics 1.4 Energy Concepts
This topic covers energy transfers in mechanical systems.
What you need to know
- Work W = Fx cos θ.
- Energy stores Ek = ½mv² and ΔEp = mgΔh; elastic energy ½kx².
- Power P = W/t and P = Fv.
- Efficiency Useful output over total input.
Common mistakes in 1.4 Energy Concepts
- Using the full distance instead of the component along the force.
- Forgetting to square v.
- Mixing up energy and power.
Try three 1.4 Energy Concepts exam-style questions
1. A 60 kg runner climbs 4.0 m of stairs in 5.0 s. Find the power. (2 marks)
Show the mark scheme answer
mgh = 60 x 9.81 x 4.0 = 2350 J (1); P = 471 W (1).
2. Define power. (1 mark)
Show the mark scheme answer
The rate of doing work or transferring energy.
3. Derive P = Fv. (1 mark)
Show the mark scheme answer
P = W/t = Fx/t = Fv.
1.4 Energy Concepts FAQs
What does Energy Concepts cover?
Work, energy stores, power and efficiency.
Is work done when carrying a bag horizontally?
No work is done against gravity, because the force is perpendicular to the motion.
What units is work in?
Joules.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
