Simple Machines, Forces, Fluids, and Pressure
Mechanical questions test practical physical relationships, levers, pulleys, gears, inclined planes, force, torque, pressure, fluids, gases, buoyancy, and volume changes.
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Core concepts
Concept 1
Simple Machines, Forces, Fluids, and Pressure questions reward the answer that follows the official source, the professional role, and the stated facts.
Exam cue: Identify the candidate role, client or public risk, source rule, calculation, or process step being tested.
Concept 2
The strongest answer identifies the rule, safety concern, ethical duty, calculation, client factor, or process step before acting.
Exam cue: Check whether the fact pattern is using a national standard, jurisdiction rule, handbook policy, or scenario-specific instruction.
Concept 3
Eliminate answers that ignore requirements, skip documentation, overreach the role, or treat convenience as the standard.
Exam cue: Choose the compliant and professionally scoped answer before the convenient or familiar answer.
Risk pitfalls and guardrails
Treating related standards as interchangeable without checking the source.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Skipping screening, documentation, authorization, sanitation, recordkeeping, or other required procedure.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Choosing an answer that protects convenience instead of client safety, public protection, or the stated professional duty.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Memory anchors
Force
Force causes acceleration, deformation, or pressure and should be understood by direction and magnitude.
Lever
Levers trade force and distance around a fulcrum, with torque depending on force times moment arm.
Pulley
Pulleys can change force direction and provide mechanical advantage when multiple supporting strands share load.
Gear
Gears trade speed and torque while reversing rotation direction when meshed directly.
Inclined Plane
An inclined plane reduces required force by spreading work over a longer distance.
Pressure
Pressure equals force over area and applies to fluids, gases, hydraulic systems, and contact forces.
Buoyancy
Buoyancy depends on displaced fluid and explains floating, sinking, and apparent weight changes.
Mechanical Advantage
Mechanical advantage compares output force to input force and usually trades force for distance.
Torque
Torque equals force times perpendicular moment arm, so distance from the pivot matters.
Supporting Strands
An ideal pulley system's mechanical advantage equals the number of rope segments supporting the moving load.
Gear Ratio
A smaller driven gear turns faster than a larger driving gear but delivers less output torque.
Pascal Principle
Pressure applied to a confined fluid is transmitted throughout the fluid, enabling hydraulic force multiplication.
Archimedes Principle
Buoyant force equals the weight of fluid displaced by the submerged portion of an object.
Continuity
For steady incompressible flow, fluid speed increases where a passage's cross-sectional area decreases.
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
A 40-pound load rests 2 feet from a lever's fulcrum. What downward force applied 4 feet from the fulcrum will balance it?
Two people balance on a seesaw. One person weighs twice as much as the other. Where must the heavier person sit relative to the fulcrum?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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