Strength of Materials
The weight of a body is due to

centripetal force of earth
gravitational pull exerted by the earth
gravitational force of attraction towards the centre of the earth.
force of attraction experienced by par-ticles

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Strength of Materials
In ideal machines

mechanical advantage is greater than velocity ratio
mechanical advantage is unity
mechanical advantage is less than velocity ratio
mechanical advantage is equal to velocity ratio

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Strength of Materials
Coefficient of friction is the

angle between normal reaction and the resultant of normal reaction and the limiting friction
the friction force acting when the body is in motion
ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move

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