__Wheel and axle__The type of simple machine which consist of two co-axial cylinders of different diameters which a mounted on the axle.

__Diameter__

**Radius**Radius is a line segment from the center to the perimeter (surrounding area) of a circle. Half of a diameter is the length of radius.

In wheel and axle radius is the effort distance.

Radius of wheel is denoted by capital r "R" where as radius of axle is denoted by small r "r".

**# Generally effort is applied in a big cylinder and load is applied on a small cylinder which means ED is greater than LD.**

**Mathematically,**

**VR =**

__ED__**LD**

**=**

__Radius of wheel__**Radius of axle**

**=**

__R__**r**

**Therefore VR of wheel and axle is =**

*R*

*r*__We know radius of wheel is greater than the radius of axle which makes the VR greater than 1 and more easy by magnification of force.__

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