In this BSc Physics video lecture in Hindi we explained, very simply, what bending moment and flexural rigidity of a beam is. During the derivation of the equation for bending moment of a beam we, at first, evaluated the longitudinal strain of an imaginary line. After the calculation of the strain we evaluated the stress produced along a that imaginary line of the beam ( so we introduced Young's modulus of elasticity ). We know that force is stress times the area, hence we derived the equation for shear force. As at the upper portion of the cross section the force acts inwards and at the lower portion it acts outwards there is a couple produced. Hence, we derived the equation for moment of force or the bending moment.
Flexural rigidity ir the bending moment for which the radius of curvature of the bent beam is unit, i.e., in S.I. 1 metre.
This video lecture in Hindi is very helpful for for students pursuing B.Sc. ( Physics Honours ).
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Arijit Daripa
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