Strength of Materials
Dynamic friction as compared to static friction is

may be less of more depending on nature of surfaces and velocity
more
same
less

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
Different at different points in its line of action
The same at every point in its line of action
Minimum when it acts at the C.G. of the body

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Strength of Materials
According to principle of moments

if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
positive and negative couples can be balanced
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

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