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A semi-circular disc is placed on a flat surface with its flat side facing upward and the curved edge in contact with the surface. The coefficient of friction between the disc and the surface is i. A horizontal force is applied at one edge to pull the disc, which stays horizontal throughout. Just before the disc begins to move, the direction of the frictional force on the top horizontal surface will ________________?

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Subject
Strength of Materialscivil-engineering-mcqs › strength-of-materials
Published
15 Jan 2019
Last updated
28 May 2026

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Explanation

When the disc is on the verge of motion, friction acts to oppose the applied force. Due to the curved contact and the way the force is applied, the frictional force on the top surface will not remain horizontal or tilt upward, but will instead incline downward in the direction of the applied pull.

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  2. 2.What is the standard SI unit used to measure work or energy?
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  6. 6.Two forces act at different angles and produce different resultant magnitudes: when perpendicular, their resultant is √10 kg, and when the angle between them is 60°, the resultant measures √13 kg. What are the magnitudes of these two forces?
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  8. 8.What does the law of the triangle of forces state?
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