Simple Machines, Forces, Motion, and Mechanical Advantage
Mechanical Comprehension questions test levers, pulleys, gears, inclined planes, force, motion, and mechanical advantage.
How to study for the SIFT
Use the seven SIFT subtests as your map: build fast visual accuracy, then rotate aviation knowledge, spatial orientation, reading, math, and mechanical reasoning.
Core concepts
Concept 1
Simple Machines, Forces, Motion, and Mechanical Advantage 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 is a push or pull that can change motion.
Mechanical Advantage
Mechanical advantage compares output force to input force.
Lever
A lever rotates around a fulcrum to move or lift a load.
Fulcrum
A fulcrum is the pivot point of a lever.
Pulley
A pulley changes force direction and can increase mechanical advantage.
Gear
A gear transfers rotational motion and can change speed or torque.
Inclined Plane
An inclined plane reduces required force by increasing distance over which work is done.
Friction
Friction is resistance between surfaces in contact.
Torque Balance
A lever balances when clockwise and counterclockwise force-times-distance products are equal.
Supporting Strands
An ideal pulley advantage equals the rope segments supporting the moving load.
Gear Ratio
A larger driven gear turns more slowly and delivers greater torque than a smaller driver.
Newton Second Law
For fixed mass, acceleration equals net force divided by mass.
Inertia
An object resists changes in its state of motion.
Centripetal Force
Circular motion requires an inward net force even when speed stays constant.
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 200-newton load is 0.5 meter from a lever's fulcrum. What input force applied 2 meters from the fulcrum will balance it?
Why does a longer wrench make it easier to loosen the same bolt?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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