Year 12
Side A4: Work, Energy & Power
Complete Side A with work, energy, power, efficiency, and a short revision block.
Part of Year 12 CIE Physics 9702.
Topic Overview
What students will cover
This topic brings the mechanics ideas together through energy transfer and rate of working. You should be able to move between force, displacement, kinetic energy, gravitational potential energy, power, and efficiency without treating each equation as a separate trick.
This is a shorter Side A topic, so keep the progression clear as you revise. Start with work and energy, then practise conservation and energy-change calculations before using power and efficiency to judge how quickly and how usefully energy is transferred.
Revision
Topic revision route
Use the generated links below to move from lesson review to retrieval practice, syllabus checks, and useful resources.
Recall vocabulary
work done
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
energy transfer
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
conservation of energy
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
gravitational potential energy
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
kinetic energy
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
Power
work done per unit time.
efficiency
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
P = W/t
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
P = Fv
A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.
Resource bank
- Lesson resources
- 9
- Topic resources
- 1
Open the relevant lesson first, then use its linked slides, worksheets, simulations, or practice tasks.
Syllabus CIE 9702 coverage in this topic
11 points across 3 lessons
Show details
CIE 9702 coverage in this topic
11 points across 3 lessons
5.1.1
understand the concept of work, and recall and use work done = force × displacement in the direction of the force
5.1.2
recall and apply the principle of conservation of energy
5.1.3
recall and understand that the efficiency of a system is the ratio of useful energy output from the system to the total energy input
5.1.4
use the concept of efficiency to solve problems
5.1.5
define power as work done per unit time
5.1.6
solve problems using P = W / t
5.1.7
derive P = Fv and use it to solve problems
5.2.1
derive, using W = Fs, the formula ∆EP = mg∆ h for gravitational potential energy changes in a uniform gravitational field
5.2.2
recall and use the formula ∆EP = mg∆ h for gravitational potential energy changes in a uniform gravitational field 1
5.2.3
derive, using the equations of motion, the formula for kinetic energy EK = 2 mv2 1
5.2.4
recall and use EK = 2 mv2
Lessons
Lesson sequence
Open lesson pages for summaries, objectives, notes, and linked resources. Test lessons stay locked for now.
Lesson
01Work & Energy
Use work done as a route into energy transfer in mechanical systems.
Lesson
02GPE, KE
Compare gravitational potential energy and kinetic energy in changing systems.
Lesson
03Power & Efficiency
Relate power to the rate of transfer and efficiency to useful output.
Lesson
04Revision
Revision lesson for Side A4.
Shared Materials
Optional topic materials
Some topics still include shared materials here alongside the lesson-specific resources.
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Topic Checklist
Syllabus Checklist
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