A damping mechanism for closing a door allows it to close on its own, as shown in the figure. The shock consists of a spring to return attached to an oil-filled damping piston. When the spring pulls the piston to the right, the teeth of the piston bar engage in a sprocket, which rotates and causes the door to close. Should the system be sub-meame, critically cushioned or over-cushioned for best performance (where the door closes quickly without hitting the frame)? Explain your answer.

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A: For solution refer below images.

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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.