E=l/2
2=l/e or l/e=2
ma =l/e
ma of single moveable pulley is : l/e=2
because lifes hard
I think what you want is the "mechanical advantage". It's 2 .
Single Pulley
The mechanical advantage would be 1 because the force required to life the mass of an object becomes 1/2 the original weight of the object.
A single movable pulley has a mechanical advantage of 2 because it reduces the effort needed to lift an object by half. This is due to the pulley system allowing the weight to be distributed between the weight being lifted and the tension in the supporting rope.
The method to calculate mechanical advantage is easy to remember and is necessary when rigging the assembly to accomplish the job. The mechanical advantage of a rigging that will require upward pull can be determined by counting the number of rope lengths running between engaged pulleys and those doing the work. Likewise, if the assembly will require downward pull, count the ropes and subtract one to get the mechanical advantage number. The subtraction is necessary because with the fixed pulley, the downward pull equals the load on the other length of rope so the last "pull" rope does not provide any mechanical advantage.
we find mechanical advantage of pulley by using principle of lever. according to this moment of effort is equal to moment of moment of load. As in this case effort arm is equal to load arm. so mechanical advantage is equal to one. but we know we can never finish friction between rope used and pulley so mechanical advantage is less than one
A single fixed pulley (:
Single fixed pulley
single fixed pulley, single movable pulley and single fixed and movable pulley. :-)
Thew pulley changes the direction of the effort force.
Depending on how the pulley is mounted and how the rope is strung, the M.A. of a set-up with a single pulley is either ' 1 ' or ' 2 '.