Question

How do you distinguish between a lever of the first order from a second and third order lever?

Answer 1

Sr. No.	Criteria	First Order Lever	Second Order Lever	Third Order Lever
1.	Middle Position	The fulcrum is located between the load and the effort.	The load is located between the fulcrum and the effort.	The effort is located between the fulcrum and the load.
2.	Arm Length	The effort arm can be longer, shorter, or equal to the load arm.	The effort arm is always longer than the load arm.	The effort arm is always shorter than the load arm.
3.	Mechanical Advantage	The mechanical advantage can be greater than, less than, or equal to 1.	The mechanical advantage is always greater than 1.	The mechanical advantage is always less than 1.
4.	Primary Function	It multiplies force, multiplies speed, or changes direction.	It acts as a force multiplier to lift heavy loads.	It acts to provide a gain in speed for the load.
5.	Examples	Common examples are scissors and see-saws.	Common examples are wheelbarrows and nutcrackers.	Common examples are sugar tongs and the human forearm.