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PULLEYS AND COMPOUND PULLEY SYSTEMS
In a system of pulleys the equilibrium between the forces depends on the path that the rope follows. PULLEYS: FIXED PULLEY : Has an axle mounted in bearings attached to a supporting structure. A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference. F: R MOVEABLE PULLEY: Has an axle in a movable block. A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two. F: R/2
1.Energy
Energy is the capacity of a body to perform transformations and do work -Form of enery - Description Potential Associated with the height of an object above the grand. Kinetic The energy of physical movement Mechanical The sum of potential and kinetic energy Sound The energy of sond waves,which are produced by vibrations Electrical ...
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