Physics is often called the EXACT SCIENCE because of the high degree of accuracy and precision with which the physicist measures the wide range of magnitudes with which he deals. Physics deals with the fundamental concepts like time, matter, energy, motion, forces, space, gravity, and radiation. It is simply defined as the science which deals with matter and energy and their transformations.

Physics is usually divided into 6 major subdivisions namely:

1. MECHANICS

2. HEAT AND THERMODYNAMICS

3. MAGNETISM and  ELECTRICITY

4. SOUND

5. LIGHT

6. ATOMIC and NUCLEAR PHYSICS

With the application of the knowledge of Physics, we are able to explain some natural phenomena; we are able to control our environment to satisfy our needs; we are able to produce and improve our means of communication and transportation; we can control diseases and understand the universe.

SOURCE: High School Book for Self Review

SYSTEMS OF MEASUREMENTS

There are only two international systems of measurement used:

a.) the Metric System from England

b.) the Metric System from France

The METRIC SYSTEM is used as the system of measurement in most countries throughout the world. The United States has traditionally used the ENGLISH SYSTEM, although the use of the metric system has become more common in recent years.

FUNDAMENTAL AND DERIVED QUANTITIES

Several quantities in Physics like volume, density, velocity, and acceleration are expressed in units which are not measurable directly by instruments. These are combination of fundamental units for the 3 fundamental quantities:

a.) length

b.) mass

c.) time

Fundamental quantities are measurable directly using standard instruments. All other quantities are derived, which are obtained by multiplying  or by dividing fundamental units.

Derived quantities are quantities which cannot be measured directly. These quantities are derived from the fundamental quantities by mathematical calculations. Density, volume, area are examples of derived quantities.

SOURCE: High School Book for Self Review

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