Mechanical advantage is how much a simple machine multiplies your force, in return for a longer path. Pick a lever, pulley or ramp and drag the sliders below to change the geometry, load and efficiency, and watch the ideal and actual advantage respond in real time.
A crowbar, a block-and-tackle, and a slope look like different tools, yet the LEVER, PULLEY, and RAMP buttons in this simulation switch between three versions of the same deal: a trade of force for distance. Tuned to give an advantage, each lets a smaller effort move a bigger load, and each charges the same price in return — a longer path to travel. The ideal mechanical advantage comes purely from geometry: for the lever it is IMA = effort arm / load arm; for the pulley it is simply the Number of supporting rope segments; for the ramp it is IMA = slope length / height. Adjust those sliders and the IMA readout tracks the shape of the machine, nothing else.
Friction then takes its cut. The Efficiency slider scales the ideal down to the actual mechanical advantage, AMA = efficiency · IMA, and the effort you actually apply follows F_effort = F_load / AMA. Drop efficiency and the effort force climbs, because you now fight the load and the friction together.
Watch the work panel to see why there is no free lunch. The effort distance stretches as d_effort = IMA · d_load, so a bigger advantage buys weaker pushes only by demanding a longer haul. Work in always meets or exceeds work out; a machine trades force for distance, never energy. Run the exact numbers in the mechanical advantage calculator, or flip through more hands-on physics simulators in the full lab collection.
It is how much a simple machine multiplies your force. The ideal mechanical advantage comes from geometry — for a lever, effort arm ÷ load arm; for a pulley, the number of supporting rope segments; for a ramp, slope length ÷ height.
No. A machine trades force for distance, not energy. A bigger mechanical advantage means a smaller effort force, but you must move it through a proportionally longer distance; the work you put in is at least the work you get out.
Ideal mechanical advantage (IMA) is set by geometry alone. Actual mechanical advantage (AMA) accounts for friction: AMA = efficiency × IMA. Since efficiency is below 100%, the actual advantage is less than the ideal, so you need a little more effort.
Lower efficiency lowers the actual mechanical advantage, so the effort force (load ÷ AMA) rises. Some of the work you do goes into overcoming friction instead of moving the load.