Strength of Materials
In ideal machines

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

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Strength of Materials
The weight of a body is due to

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

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Strength of Materials
Limiting force of friction is the

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

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