Stability, Centre of Gravity and Dynamic Effects
Stability margins, combined centres of gravity, gradients, momentum, turning, braking and load swing.
How to prepare for a CPCS category Theory Test
Learn the operator's safe decision sequence, connect it to the current category learning outcomes and practise explaining why the manufacturer, task and site controls apply.
Core concepts
Concept 1
Stability changes as load position, radius, height, ground angle and machine configuration change.
Exam cue: Ask how each movement shifts force or centre of gravity.
Concept 2
Turning, braking, acceleration, slew and swinging loads create dynamic effects beyond static weight.
Exam cue: Reduce speed and stop if stability cues change.
Concept 3
A trial movement is controlled and does not authorise exceeding the chart or plan.
Risk pitfalls and guardrails
Assuming a load safe at rest is safe through travel or slew.
Guardrail: Do not replace a manufacturer limit, competent plan, physical control or authorised decision with experience or memorised wording.
Using counterweight intuition instead of specified limits.
Guardrail: Do not replace a manufacturer limit, competent plan, physical control or authorised decision with experience or memorised wording.
Memory anchors
Static Is Not Moving
Dynamic forces can consume stability margin.
Higher, Wider Risk
Raised or extended loads change the centre of gravity.
Turn Gently
Direction changes add lateral force.
Swing Adds Reach
A swinging load can increase effective radius.
Slope Tilts Margin
Gradient changes the stability relationship.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”