Page 15 - Physics

Introduction to Physics

Remember that, if these laws are disobeyed, ships sink and trains derail. Ships and
boats have refrigerators and air conditioners that function through the application of
the laws of physics. Heat is removed from the fridges by the refrigerant and prevented
from entering the fridge by using insulating materials such as a rubber strip attached to
the fridge door.

(a) A cargo ship (b) Standard gauge railway (c) An aeroplane
(SGR) train
Figure 1.13: Transport vessels
Communication
Communication is important to human life as it keeps us informed of day-to-day
happenings. Devices used in communication systems such as radio masts, telephones
and satellite dishes shown in Figure 1.14, antenna and modems are used for accessing
the internet, television, and radio signals using physics principles. Therefore, the
knowledge of physics is essential in constructing these instruments.

(a) Radio mast (b) A telephone set (c) Satellite dish
Figure 1.14: Communication devices

Short messages (SMS) through mobile phones, electronic mail (emails), and fax
messages from fax machines are also reliable means of communication. All these are
the results of the application of the principles of physics. Figure 1.15 shows SMS,
email and fax from the mobile phone, computer display and fax machine.

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Physics Form 1 Final.indd 9 16/10/2024 20:55