A screw jack has a screw thread, 7.5 cm mean diameter and 1.5 cm pitch. The load on the jack revolves with the screw. The coefficient of friction at the screw threads is 0.05. (1) Find the tangential force to be applied to the jack at 36 cm radius so as to lift a load of 600 N. (2) State whether the jack is self- locking. If it is, find the torque necessary to lower the load. If not, find the torque which must be applied to keep the load from descending.

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Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.