Must the potential energy of a body of weight Win a gravitational field always be positive? Explalh. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).
Theory and Design for Mechanical Measurements
Measurement is a term that refers to analyzing a manufactured component regarding the degree of accuracy for dimensions, tolerances, geometric profile, roundness, flatness, smoothness, etc. Measurement always involves comparing the manufactured component or the prototype with a standard specimen whose dimensions and other parameters are assumed to be perfect and do not undergo changes with respect to time.Precisely in mechanical engineering the branch that deals with the application of scientific principles for measurements is known as metrology. The domain of metrology in general deals with various measurements like mechanical, chemical, thermodynamic, physical, and biological measurements. In mechanical engineering, the measurements are limited to mechanical specific such as length, mass, surface profile, flatness, roundness, viscosity, heat transfer, etc.
Basic principles of engineering metrology
Metrology is described as the science of measurement, precision, and accuracy. In other words, it is a method of measurement based on units and predefined standards.
The potential energy of a body in a gravitational field is the energy possessed by virtue of its position above the surface of the earth in a gravitational field.
The gravitational potential energy of a body is the work done on the body in bringing that body from infinity to a point in the gravitational field. Since the law of gravitational potential energy is inverse, the potential energy at infinity will be zero.
Thus, the sign of the gravitational potential energy will be dictated by whether the work is done on the body or by the body.
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