Strength of Materials
Kinetic friction is the

The friction force acting when the body is just about to move
Tangent of 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

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Strength of Materials
Which one of the following statements is not correct

the angle of repose is equal to angle of friction
the sine of the angle of repose is equal to coefficient to friction
the tangent of the angle of friction is equal to coefficient of friction
the tangent of the angle of repose is equal to coefficient of friction

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Strength of Materials
In ideal machines

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

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