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I've always being fascinated by tackles because they seem "magical" to me. In the picture below the force needed to lift the weight is reduced 4 times and adding up 1 pulley it would be reduced 8 times and so on......So my question is: what's the limit? Using a 100 pulleys tackle could i lift up my car with my little finger?  Thanks in advance 

Risultati immagini per tackle

tackle.jpg

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Friction eventually imposes a limit. If there were no friction, you could just add pulleys ad infinitum, but in reality, each new pulley adds friction to the system. Eventually you would get to a point of diminishing returns.

DrD

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Also, adding more pulley means that the vertical movement reduced for each additional pulley. 

using 1 pulley, F = W, you move F 1 m, you get W lifted for 1 m.

using 2 pulley, F = W/2, you move F 1 m, you get W lifted for only 0.5 m.

using 3 pulley, F = W/3, you move F 1 m, you get W lifted for only 0.333 m.

But mostly, what DrD said.... friction

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