# My Science Notebook: Couple(physics)

in Steem Geography2 months ago

These the pair of equal and opposite forces whose line of action does not meet but brings about turning effect.

**Moment Of Couple (Torque) **
This is the product of one of the forces and the perpendicular distances between the line of action of the two forces. The moment of couple is called Torque.

Example of couple :

1. Turning of a door knod
2. Turning off and on of a water tap
3. Loosing a knot with a screw

Condition Of Equilibrium
A body is said to be equilibrium if it does not move when acting upon on several forces. An object at rest is said to be in a state static equilibrium while an object in uniform.

Equilibrium Of Forces
Equilibrium of forces is that single force which balance all the forces taken together.
These forces always equal in magnitude and opposite direction to resultant forces.

Equilibrium Of Parallel Forces
Engineers need to know the total forces that will be exerted on bridges in order to enable the bridge to stand firm.
These must be kept in equilibrium by parallel forces, these force acts vertically downward on the bridge.

Types Of Equilibrium

1. Stable equilibrium : A body is said to be in a stable equilibrium when on receiving a slight displacement, it tends to return to it original position.

2. Unstable equilibrium: A body is said to be an unstable equilibrium when receiving a slight displacement tends to move further on it original position.

3. Neutral equilibrium: A body is said to be in a neutral equilibrium when receiving a slight displacement tends to call in it new position.

Thanks for reading my physics note
Have a nice day everyone.

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@belenguerra
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