Engineering Mechanics Exam Prep
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Engineering Mechanics Exam Prep
Engineering Mechanics is the branch of physics that deals with the analysis of forces and their effects on bodies in equilibrium and motion. Key principles include the laws of motion, equilibrium conditions, and the beha...
Sample questions with model answers
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State and prove Parallelogram law of forces.
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The Parallelogram law states that if two forces acting at a point are represented in magnitude and direction by the two sides of a parallelogram, then their resultant is represented by the diagonal.
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State and prove Lami’s theorem.
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Lami's theorem states that if three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle opposite to it.
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Explain screw jack with neat sketch.
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A screw jack is a simple machine used to lift heavy loads by converting rotational motion into linear motion.
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A body of weight W is placed on a rough inclined plane of inclination α. Find the force which should be applied parallel to the plane so that the body is on the point of motion: (i) down the plane (ii) up the plane.
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The required force is F = W sin(α) + μW cos(α) for down the plane, and F = W sin(α) - μW cos(α) for up the plane.
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