Notes

The device consisting of very few parts that makes work easier, faster or more convenient is called simple machine. Complex machine are formed by combination of many simple machines. Functions of simple machines are : A simple machine is used to overcome a load by applying small force. A simple machine is used to change the direction of force. A simple machine increases the speed of work. Effort is the force applied to the machine. Load is the force applied by the machine to the body. Fulcrum is the support point required to turn or rotate the machine. The distance of effort from fulcrum is effort arm. The distance from fulcrum to load is load arm. The work done on the machine is called input work. Input work = effort × effort arm The work done by the machine on the load is output work . Output work = Load × Load arm The ratio of load overcome by a machine to effort applied in the machine is mechanical advantage. Mechanical advantage =  load effort The velocity ratio of a simple ...