For procedures, see your mechanical laboratory manual.

Title: Wheel & Differential Axle Experiment


Aim

1. To determine the velocity ratio of the machine.
2. To obtain an equation for the relationship between load and effort and hence obtain a value for the limiting efficiency of the machine.

Theory

It is an improved form of the Simple Wheel & Axle, in which the velocity ratio is intensified with the help of a loaded axle. The differential axle is used to differentiate torque between wheels.

V.R. = Distance moved by effort P/ Distance moved by load = πD/ π/2(d1 - d2) = 2D/(d1 - d2)

M.A.= W/P

Efficiency, Å‹ = M.A./ V.R.

Applications

1. Revolving doors
2. Electric fans
3. Bicycle
4. Cars

References

1. Wheel and Axle, wikipedia.org
2. Examples of Wheel & Axle Simple Machines, www.sciencing.com
3. Simple Machines, wikipedia.org