It is form with a wheel that it has a central orifice that permit rotate fixed or freely on its axis,has got a channel in its periphery for can drag or be drag for one rope,chain,belt... There are different types of pulleys FIXED PULLEY:formula(F=R) MOVABLE PULLEY:formula(F=R/2) HERE WE HAVE SOME EXERCISE FOR PRACTISE THE PULLEYS.(interesting,and good for revise) http://www.educa2.madrid.org/web/educamadrid/principal/files/a1c18b06-dde8-4e44-98a0-49f0e0f2c425/M%c3%81QUINAS%20Y%20MECANISMOS/M%c3%a1quinas%20y%20mecanismos.pdf
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