Screw Jack

A Screw Jack consist of a cylinder with a spiral ridge runs round it. The spiral is called the thread (T) and the distance between two adjacent threads is called the pitch (p) of the screw.
Consider the following diagram.

Example 1

 A screw jack with a pitch of 0.2cm and a handle of length 50cm is used to lift a car of weight 1.2 x 10⁴N. If the efficiency of the screw is 30%, find:

a)    The velocity ratio and mechanical Advantage of the machine.  CONTINUE READING

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Concept Of Simple Machines

Simple machine is any device, which requires single force in operation to simplify work e.g. Claw – hammer, a pulley, and an inclined plane.

In a simple machine, a force is applied at one convenient point to overcome another force acting at another point.

The diagram above shows a stone being shifted. Force is applied at one end of the bar in order to exert an upward force on the stone. The down ward force is called effort and the weight of the stone is called load.

Effort is the force used to operate a machine.

Load is the resistance, which machines overcome..  CONTINUE READING

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