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Fundamental Quantities
These are quantities that are independent on any other quantities for them to be formed, that is they are not derived from any other quantity.

Examples Of Fundamental Quantities

> Mass
> Time
> Amount of substance
> Current
> Resistance
> potential Difference etc

Fundamental Units

These are units that are independent on any other units.

Length - metres ( m)
Mass - kilogram (kg)
Time - Seconds (S)
Amount of substance -Moles (mol)
Current - Amperes (A)
Potential difference - Volts (V)

Derived Quantities
These are those quantities that are dependent on the fundamental quantities to be formed. This mean that they are all derived from the fundamental quantities

Examples are:

Speed velocity
Acceleration
Force
Work done
Kinetic energy
Potential energy power
Density pressure etc

Derived Units

These are the units of the derived quantities that are dependent on the fundamental unit for them to be formed. These units are derived from the fundamental units.

Examples are:

Velocity is the rate of change of displacement with time
- Distance/Time = metres/s = m/s
- Acceleration is the rate of change of velocity with time.
- Acceleration is measures in metres per second square

Force can be defined as the product of mass and its acceleration
- F = mass x acceleration
- Force is measured in kilogram meter per second square which is equivalent to Newton

Work done is the product of force and the distance covered by the body in a motion.
- W.D = Force x distance
- F x d
- Work done is measured in kilogram metre square per second square which is equivalent to Joules.

Kinetic Energy is an energy possessed by a body when it is in motion.

- K.E = 1/2 mv2
- Where m = mass of the body
- V = Velocity of the moving body
- The unit of kinetic energy is half kilogram metre square per second square which is equivalent to Joules.

Potential energy is the energy possessed by the body when the body is at rest.
- P.E = Mgh
- Where M = mass of the body
- G = acceleration to gravity
- H = Height of the body
- The unit of potential energy is kilogram metres square per second square which is equal to Joules.

Power is the rate of work done per unit time.

- Power = WORK DONE/TIME =W.D/T

Pressure can be defined as the ratio of force to it's area

- P = Force/Area =F/A

Submitted by: Floxy