Engineering Mechanics
The ratio of limiting friction and normal reaction is known as

Coefficient of friction
Angle of friction
Angle of repose
Sliding friction

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

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Engineering Mechanics
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Maximum, if it acts at the center of gravity of the body
Different at different points on its line of action
Same at every point on its line of action
Minimum, if it acts at the center of gravity of the body

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