Lesson 09
Test Review
Review common errors and strengthen weak areas after the topic test.
Objectives
Lesson outcomes
- Correct errors from the A1 topic test using clear physics reasoning.
- Identify whether mistakes came from definitions, equation choice, graph interpretation, or calculation.
- Set targeted follow-up practice for the weakest part of circular motion or oscillations.
Syllabus
CIE 9702 syllabus points
17 linked
- 12.1.1 define the radian and express angular displacement in radians
- 12.1.2 understand and use the concept of angular speed
- 12.1.3 recall and use ω = 2π / T and v = rω
- 12.2.1 understand that a force of constant magnitude that is always perpendicular to the direction of motion causes centripetal acceleration
- 12.2.2 understand that centripetal acceleration causes circular motion with a constant angular speed
- 12.2.3 recall and use a = rω2 and a = v2 / r
- 12.2.4 recall and use F = mrω2 and F = mv2 / r
- 17.1.1 understand and use the terms displacement, amplitude, period, frequency, angular frequency and phase difference in the context of oscillations, and express the period in terms of both frequency and angular frequency
- 17.1.2 understand that simple harmonic motion occurs when acceleration is proportional to displacement from a fixed point and in the opposite direction
- 17.1.3 use a = – ω2 x and recall and use, as a solution to this equation, x = x0 sin ωt
- 17.1.4 use the equations v = v0 cos ωt and v = ± ω (x02 − x 2)
- 17.1.5 analyse and interpret graphical representations of the variations of displacement, velocity and acceleration for simple harmonic motion
- 17.2.1 describe the interchange between kinetic and potential energy during simple harmonic motion 1
- 17.2.2 recall and use E = 2 mω2 x02 for the total energy of a system undergoing simple harmonic motion
- 17.3.1 understand that a resistive force acting on an oscillating system causes damping
- 17.3.2 understand and use the terms light, critical and heavy damping and sketch displacement–time graphs illustrating these types of damping
- 17.3.3 understand that resonance involves a maximum amplitude of oscillations and that this occurs when an oscillating system is forced to oscillate at its natural frequency
Definitions
Required definitions
Radian
the angle subtended at the centre of a circle by an arc equal in length to the radius.
Lesson Notes
Student guidance and lesson notes
Overview
This lesson uses the A1 test to improve the next round of revision. The aim is to understand why errors happened, correct them properly, and decide what needs more practice.
What You Need to Know
- A useful correction explains the physics, not just the final answer.
- Most errors in this topic come from direction, equation choice, graph interpretation, or weak definitions.
- Similar-looking questions can require different models, especially when comparing circular motion and SHM.
- Feedback should lead to a specific practice target.
How to Work Through It
- Sort your test errors by topic and skill: definitions, equations, graphs, or calculations.
- Rewrite selected answers with the missing physics included.
- Rework at least one similar question without looking at the original solution.
- Finish with a short target for future A2 mechanics and oscillations revision.
Check Your Understanding
- Which mistake cost the most marks, and why?
- Was the weak step physics understanding, algebra, units, or exam wording?
- Can you now explain the corrected answer without reading from the mark scheme?
Common Mistakes
- Copying the mark scheme without identifying the original misconception.
- Correcting calculations while leaving the wrong force direction or graph interpretation unchanged.
- Treating one weak question as isolated when it shows a broader skill gap.
Next Steps
- Add the weakest A1 subtopic to your next independent revision cycle.
- Keep corrected examples available for later A2 mechanics and oscillations review.