Page 13 - Physics

Introduction to Physics

Similarly, it would be difficult to get In hospital
underground water to the surface without Various machines are used in hospitals
a pulley system or water pumps. Pulleys for the diagnosis and treatment of various
are used for drawing water from wells by diseases. These machines are designed
applying a small force, F shown in Figure 1.8. and constructed using physics principles.
Such machines include diagnostic X-ray
and ultrasound machines. Figure 1.10
F shows an ultrasound machines. Handling
and using these machines is based on the
knowledge and skills acquired in physics.
This means that those who operate these
machines must know physics.

Figure 1.8: Drawing water from a deep well

Physicists have reduced the cost of
electricity by applying physics principles
to design and construct energy saving bulbs
such as Compact Fluorescent Lamp (CFL)
and Light Emitting Diodes (LED) shown
in Figure 1.9.

Figure 1.10: Ultrasound machine
(a) Compact fl uorescent lamp (CFL)

In addition, premature babies are nursed
in incubators, shown in Figure 1.11(a),
until they attain a safe weight and physical
condition for them to survive on their
own. The conditions in incubators are
modifi ed to the extent that they resemble
a mother’s womb to support the survival
(b) Light emitting diode (LED) lamp
of the babies. Syringes and needles for
Figure 1.9: Energy saving lamps

7

Physics Form 1 Final.indd 7 16/10/2024 20:55