Lesson
01Work & Energy
Use work done as a route into energy transfer in mechanical systems.
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 should bring the mechanics ideas together through energy transfer and rate of working. The lesson sequence is shorter, so the topic page should make the progression especially clear.
Syllabus CIE 9702 coverage in this topic
11 points across 3 lessons
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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
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