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  caridelo , multiple pulleys ....
  Posted by: pilotwingz on Jun-24-13 6:58 AM (EST)

-- Last Updated: Jun-24-13 9:54 AM EST --

.... on the same axle is what I have always considered a tackle (block and tackle) , and more than a single pulley in the system is what I have always considered compound pulleys .

I suppose I could add that there is usually a combination of both fixed and movable pulleys in a compound pulley system .

I could be incorrect but I don't think so .

I've always thought that the lifting ability (advantage) of the pulleys is directly related to the number of pulleys in the system and their associated connections to the load .

A block and tackle at top with a single pulley at bottom attached to the load , would increase the advantage more than a single pulley at top and a single pulley at bottom attached to the load ... yet both systems would be compound pulley systems and either system may be considered a block and tackle system . Is this not correct ??

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