### Table of Contents

Definition

**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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Definition

**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.

Definition

**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:

$F_{x}=F\cos\theta$ $F_{y}=F\sin\theta$

Definition

**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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Definition

**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.

Definition

**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.

Definition

**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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Definition

**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.

Definition

**Neutral equilibrium: **

A body that remains in its new position when disturbed from its previous position is said to be in a state of neutral equilibrium.

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