Name: John Bird: Engineering and Physical Science Pocket Book
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[Front]

Systèm Internationale d’Unites (International system of units).

[Back]

SI Units-

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John Bird: Engineering and Physical Science Pocket Book - Detalles

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Systèm Internationale d’Unites (International system of units).

SI Units-

The amount of matter in a body.

Mass-

A unit of charge.

Coulomb (C)-

6.24x10^18 electrons (one ampere second). Is defined as the quantity of electricity which flows past a given point in an electric circuit when a current of one ampere is maintained for one second. Thus, Q=It. I is the current, and t is the time in seconds.

1 Coulomb =

Unit of force.

Newton (N)-

1 kilogram metre per second squared. Is defined as the force which, when applied to a mass of 1kg, gives it an acceleration of one metre per second squared. Thus, F=ma, where F is the force, m is the mass in kgs, and a is the acceleration in metres per second squared.

1 Newton (N) =

Unit of work or energy. 1 Joule is 1 newton metre. Is defined as the work done or energy transferred when a force of one newton is exerted through a distance of one metre in the direction of the force. Thus, W=Fs, where F is the force and s is the distance in metres moved by the body in the direction of the force. Energy is the capacity for doing work.

Joule (J)-

Unit of power. 1 watt = 1 joule per second. Is defined as the rate of doing work or transferring energy. Thus, P=W/t, where W is the work done or energy transferred in joules and t is the time in seconds. Hence, energy in joules, W=Pt.

Watt (W)-

A unit of electric potential, where one volt is one joule per coulomb. Is defined as the difference in potential between two points in a conductor which, when carrying a current of one ampere dissipates a power of one watt. The electromotive force (e.m.f) is measured in volts.

Volt (V)

The mass per unit volume of a substance. Density = mass/volume. Its units are kg/m^3.

Density-

The ratio of the density of a substance to the density of water. Relative density = density of substance/density of water.

Relative density-

Scalar quantities

Only have a size or magnitude and need no other information to specify them.

Vector quantities

Have both a size or magnitude and a direction, called the line of action of the quantity.

Gravitational Acceleration

Quantity Symbol: g; Unit: metres per second squared; Unit Symbol: m/s^2

Linear Acceleration

Quantity Symbol: a; Unit: metres per second squared; Unit Symbol: m/s^2

Angular Acceleration

Quantity Symbol:x Unit: Radians per second; Unit Symbol: rad/s