When a rigid body is suspended vertically, and it oscillates with a
small amplitude under the action of the force of gravity, the body is
known as

A redundant frame is also called __________ frame.

The angle between two forces when the resultant is maximum and minimum respectively are

The algebraic
sum of the resolved parts of a number of forces in a given direction is
equal to the resolved part of their resultant in the same direction.
This is known as

The triangle law
of forces states that if two forces acting simultaneously on a
particle, be represented in magnitude and direction by the two sides of a
triangle taken in order, then their resultant may be represented in
magnitude and direction by the third side of a triangle, taken in
opposite order.