Table of Contents
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Like Parallel forces:
If the direction of parallel forces is the same, they are called parallel forces.
Unlike Parallel forces: If two parallel forces are in opposite directions to each other then they are called, unlike parallel forces.
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Head to the tail rule:
A graphical method used to find the resultant of two or more forces is called the head-to-tail rule.
Resolution of that force:
Splitting up a force into two components perpendicular to each other is called the resolution of that force. These components are:
$F_{x}=F\cos\theta$ $F_{y}=F\sin\theta$
Torque or moment:
Torque or moment of the force is the turning effect of the force. The torque of a force is equal to the product of the force and the moment arm of the force.
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Principle of the moment:
According to the principle of moments, the sum of clockwise moments acting on a body in equilibrium is equal to the sum of the anticlockwise moments acting on it.
Centre of mass:
The Centre of the mass of a body is such a point where the net force causes it to move without rotation.
Centre of gravity:
The center of gravity of a body is a point where the whole weight of a body acts vertically downward.
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Unstable equilibrium:
If a body does not return to its previous position when set free after a slight tilt is said to be in unstable equilibrium.
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