Strength of Materials
Two non-collinear parallel equal forces acting in opposite direction

balance each other
constitute a couple
constitute a moment
constitute a moment of couple

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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
Limiting force of friction is the

The friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction
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

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