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Friction:
When a body moves or tends to move over the other body, a force opposing the motion develops at the contact surfaces. This force that opposes the movement or the tendency of movement is called as frictional force or simply friction. Frictional force acts parallel to the surface of contact always, opposite to the moving direction and is dependent on the roughness of surface.
A frictional force develops when there is relative motion between body and surface on application of some external force.
A frictional force is dependent upon the coefficient of friction between the surface and the body which can be minimized up to very low value equal to zero (theoretically) by proper polishing the surface.
Beam: Sol.: A beam can be defined as a structural element which has one dimension (length) considerable larger As compared to the other two direction, which is breadth an
Consider some publications of the Bureau of Standards. The following publications of the Bureau of Standards shall be read along with this section of footings. a. IS 456 in
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