Calculation
F = m·g / n
Each supporting strand shares load ideally; friction increases real pull force.
F = m·g/n
Pulley mechanical advantage
Each supporting strand shares load ideally; friction increases real pull force.
MINTSI
02
Result
Select a target and calculate.
Understand the inputs
- Pull force F — Ideal hand or drive force at free end.
- Load mass m — Mass to lift.
- Gravitational acceleration g — Local gravitational acceleration.
- Supporting strands n — Number of rope strands supporting moving load.
Example
100 kg with two supporting strands: 490 N ideal.
Assumptions and limits
Frictionless pulley; rope weight and elasticity are excluded.
Sources