Lever resistance (or load). It is common to call the input force "the effort" and the output force "the load" or "the resistance." This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: These cases are described by the mnemonic "fre 123" where the fulcrum is in the middle for the 1st class lever, the "r"esistance is in the middle for the 2nd class lever, and the effort is in the middle for the 3rd class lever. The lever is a movable bar that pivots on a fulcrum attached to
Darcy Lever at Darcy Lever. Darcy Lever had little industry other than the coal mining. Many inhabitants not involved in coal mining found employment on the Manchester Bolton and Bury Canal or in the textile mills of Bolton and Farnworth. Today, that situation still exists with most of the working population commuting out of Darcy Lever to work in Bolton, Manchester and other nearby towns. Darcy Lever was not worked for coal as much as nearby Little Lever due to the fact it lay further off the Irwell Valley fault which had uplifted the coal measures making them easier to work. There