Page 36 - Physics

Physics for Secondary Schools

measurements, as well as Metre Rule: This rule has a length of 1 metre (100
balances to quantify mass. centimetres). It is commonly made of wood, plastic,
These tools enable physicists or metal and is primarily used for measuring longer
to explore fundamental distances, often in educational and professional settings
principles, ensure precision like classrooms and workshops. Suitable for measuring
in their measurements, and larger objects and distances, making it ideal for geometry,
contribute signifi cantly to craft projects, and mechanical work.
the advancement of scientifi c A 50 cm Rule: It is sometimes referred to half metre rule
knowledge. because it has a length of 50 centimetres (0.5 meters).

A 50 cm ruler is more compact than a metre ruler, often
Ruler favoured for portability and ease of use in smaller projects.
A ruler is a measuring Commonly used in schools for drawing straight lines,
instrument used to determine measuring paper, and conducting small experiments. It
the length or distance of is also popular among artists and designers.
objects. It typically consists
of a fl at, rigid strip marked A 30 cm Rule: A 30 cm ruler is typically the smallest
with units of measurement, of the three categories and is often made from fl exible
enabling users to obtain materials or plastic. Ideal for students, it is commonly used
precise measurements easily. for everyday tasks like measuring small items, drawing
straight edges, and creating precise lines in artwork or
Classifi cation of ruler homework assignments.
The rulers have been
classifi ed into two categories
such as rigid rulers and the (a) 50 cm rule
fl exible rulers. Each category
of ruler serves its purpose
according to the length of (b) 30 cm rule
measurement required, with Figure 2.1: Classifi cation of rulers
varying levels of portability
and application suitability. Flexible Ruler
Flexible rulers can bend and curve, making them suitable
Rigid Rules for measuring lengths that are not straight.
Rigid rulers are solid and
do not bend, providing Tape Measure:
consistent accuracy in This kind of fl exible ruler typically extends anywhere
measuring straight lines. from 1 metre to 10 meters or more. It consists of a long,
Common types include fl exible strip marked with measurements, often housed in a
metre ruler, 50 cm ruler retractable case. It can easily bend around curves or objects
and 30 cm ruler as discussed and latch onto edges for precise measurements. Such a ruler
hereunder. is widely used in construction, tailoring, and DIY projects,

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Student’s Book Form One

Physics Form 1 Final.indd 30 16/10/2024 20:55