Screw Jack – Small is a compact mechanics laboratory model designed to demonstrate the working principle of a screw jack and its application as a simple lifting machine. It helps students understand how rotational effort is converted into linear motion for lifting loads.

The apparatus consists of a precision screw jack mounted on a 12 cm diameter metallic circular base. A 10 cm diameter turned aluminium pulley is fitted for applying effort, while an adjustable guide pulley supports smooth operation during experimentation. A vertical linear scale is provided for accurate observation and measurement.

With an overall height of approximately 15 cm, this small screw jack model is easy to handle, stable in use, and suitable for classroom demonstrations and physics laboratory practicals.

Experimental Objectives

To demonstrate the working principle of a screw jack.
To determine the mechanical advantage of the screw jack.
To determine the velocity ratio of the apparatus.
To calculate the efficiency of a screw jack.
To understand the relationship between load, effort, mechanical advantage, velocity ratio, and efficiency.