Question

Describe the relationship 18

What is a lever? On which principle does it work?
Is velocity ratio of a machine affected by applying​

Answer 1

A lever is a bar that turns on an unmoving point called a fulcrum. When you push or pull on one end of the bar that pressure is called the force. The object that is lifted on the other end is called the load.

Explanation:

Let a machine overcome a load L by the application of an effort E. In time t, let the displacement of effort of dE ad the displacement of load be dL.

Work input =Effort× displacement of effort

=E×dE

Work output =Load× displacement of load

=L×dL

Efficiency=Work inputWork output

=E×dEL×dL=EL×dEdL

=EL×dE/dL1

But Effort(E)Load(L)=M.A.

and dLdE=V.R.

∴Efficiency η=V.R.M.A. or M.A.=V.R.×η

Thus, the mechanical advantage of a machine is equal to the product of its efficiency and Velocity Ratio.