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1.1 Introduction to Physic

Understanding Physics

The study of the laws that determine the structure of the universe with reference to the matter and energy of which it consists.

The study was divided into separated fields; heat , the properties of matter, light, sound ,wave, electricity, magnetism, mechanics, nuclear physics etc.

In physics , there is the need to make careful observations, precise and accurate measurements.

Understanding  natural phenomena and observing everyday objects such as a table, a mirror etc and discuss how they are related to physics concepts  has always been a  central aim of physics.

The roots of all science are firmly based in experiment. Of course , mastering scientific skills applying scientific knowledge must be the important thing to learn physics.

Physical Quantities

Physics is based on measurement. We discover physics by learning how to measure the quantities that  are involved in physics and we call its as physical quantities.

The meaning of Physical Quantities

Physical quantities are quantities that can be measured.

Examples of physical quantities are length, mass, time, weight, pressure, current and force.

A physical quantity is a property ascribed to phenomena, objects, or subtances that be quantified.

Example are:

(i)      Frequency of oscillation – frequency is the quantity and oscillation is the phenomenon

(ii)     Length of a wooden block – Length is the quantity and the wooden block is an object

(iii)    Density of water – density is the quantity and the water is the substance

There are two types of  the physical quantities,

  • Base quantities
  • Derived quantities

Base Quantities

The physical quantities which are used as the basis for the measurement and can’t be derived from other physical quantities.

There are  five base quantities as shown in the following table:

Base

quantity

Symbol

Unit name

Unit

Abbreviation

Measured

by

Length

l meter m Ruler

Mass

m Kilogram kg

Triple Balance beam

Time

t Second s Stopwatch

Temperature

T Kelvin K Thermometer

Current

I Ampere A Ammeter

Derived Quantities

The physical quantities which were derived from base quantities by multiplication operation or division  operation or both

There are three examples for derived quantities as shown in the following table.

 

Derived quantity

Symbol

In term of the base  quantities

Derived unit

Area

A m x m

m2

Velocity

v clip_image002[13] m s-1

Density

clip_image002

clip_image002[15] kg m-3

2 Responses

  1. assalamualaikum.. boleh saya dapatkan jawapan kepada latihan2 setiap chapter form 4 physics???

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