Page 10 - Physics

Physics for Secondary Schools

We learn about radiation which is emitted Physics and biology
by the atom during disintegration and how A number of instruments such as
we can protect ourselves from harmful microscopes used in biology are designed
radiation. and constructed using physics principles.
Processes such as photosynthesis,
Connection between Physics and conversion of matter into energy, and
other disciplines even the transfer of heat used in biology
Physics relates to many subjects in terms of can be well explained by using laws of
either direct applications or the principles physics.
governing the working of instruments used
in a given subject. Physics is closely related Physics and mathematics
to chemistry, biology and mathematics. Mathematics is a working tool of
Physics is also related to earth sciences almost all disciplines. All branches
such as geology and meteorology. The of mathematics for instance, algebra,
relationships between physics and other trigonometry, and vectors are applied to
subjects are discussed below. study physics. More often mathematical
relations are used in expressing physics
Physics and chemistry concepts. For instance, force, F is directly
Chemistry principles are used to produce proportional to extension, e. This concept
pesticides and insecticides (see Figure 1.3), can be expressed mathematically as;
perfumes, and fertilizers. Then, physics F ∝ e
principles are applied in packaging them
so that they can be released in a controlled F = ke
manner from compressed cylinders or where k is a constant of proportionality.
sprays. Also, chemists use equipment A graph of force, F against extension, e is
designed and constructed using physics shown in Figure 1.4.
principles to achieve extraction of
chemicals. Force against Extension graph

Force (N)

Extension (m)

Figure 1.3: Pesticide and insecticide Figure 1.4: Graph of force against extension

4
Student’s Book Form One

Physics Form 1 Final.indd 4 16/10/2024 20:55