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eng.pulley-mechanical-advantage Calculator
Calculates the mechanical advantage of a pulley system from the number of rope segments supporting the load. A movable block-and-tackle with 4 rope segments has MA = 4 — the force required is reduced to 25% of the load, but the rope must be pulled 4× the load movement.
Inputs
Effort N
Push or pull (N). F = ma. Net force determines acceleration. Account for all forces including gravity and friction.
Load N
Body or object weight. For health calculators, usually in kg or lbs.
Rope Segments
Reference formula or conversion factor shown for context.
Friction Pct
Reference formula or conversion factor shown for context.
Results
actual mechanical advantage MA
Sample size or count used in the calculation.
ideal MA
Reference formula or conversion factor shown for context.
efficiency η
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
velocity ratio (rope moved / load moved)
The proportional relationship between two quantities.
ideal MA = n (rope segments)
Sample size or count used in the calculation.
effort to lift
Aerodynamic force perpendicular to the direction of motion. Lift = 0.5 × rho × v^2 × Cl × A. Enables flight when it exceeds weight.