We use different kinds of machines and
tools in our daily life. Simple machines
are those instruments in which effort is
applied at a more convenient point in a
more convenient direction. The work done on a machine is called input and the work done by the machine is called output. Input is the product of force and distance through which force is applied and output is the product of load and
distance through which load is moved. A
simple machine is a device, which makes our work easier by 1. increasing the force applied 2. changing the direction of force applied 3. transferring the force from one place to another 4. increasing the speed of a force All machines work on the principle that when the effort is smaller than the load,
it has to move a greater distance than
the load in order to lift it up. There are
six types of simple machines, they are: 1. Lever 2. Pulley 3. Wheel and axle 4. Inclined plane 5. screw 6. Wedge Principle of a simple machine The principle of machine is Input work = Output work Or, E x E. d = L x L. d Where, E = Effort E. d = Effort distance L = load L. d = load distance