Machine

Things to remember

• Those tools or devices which make our work easier and convenient in the direction of force is called simple machine.
• Simple machine helps us by magnifying force, accelerating work and by changing the direction of force.
• Velocity ratio of simple machine is the ratio of distance traveled by effort to the distance traveled by load in the machine.
• The efficiency of a simple machine is defined as the ratio of useful work done by machine (output work) to the total work put into machine (input work).
• The ratio of the load to the effort in a simple machine is called mechanical advantages or actual advantage of the machine.