Page 38 - Physics

Physics for Secondary Schools

The actual length of the table is then given Procedure:
as: 100 cm + 40 cm = 140 cm. Therefore, 1. Walk around your school compound,
the table has a length of 140 cm or 1.4 m. identify the objects presented in
Table 2.4.
In case the edge of a ruler is worn out, 2. Measure the lengths the objects
which is almost inevitable and the zero (0
cm) mark not clearly seen, it is advised to: provided and record in Table 2.4.
(i) always start measuring from the Table 2.4
mark more than zero; and Quantity to be Measurement
(ii) subtract the mark from the fi nal measured made
reading.
Width of your
Figure 2.6 illustrates the use of a ruler with classroom
worn-out edges. Height of your
classroom door
Length of your
laboratory fl oor
Width of your
classroom window
Circumference of
Figure 2.6: Using a ruler with a worn-out edge a ten litre bucket
Length of physics
The length of the object is, exercise book
9.6 cm 3.2 cm 6.4 cm. 
Questions
Task 2.2 1. Imagine your Physics teacher
asks you to measure the length of
Measure the length and width of the a playing ground. Which type of
cover of your physics textbook to the
nearest tenth of a centimetre. Record instrument will you use? Why?
your results. Calculate the perimetre 2. How can you apply the skills learnt
of the cover. in this activity in your daily life
activities?
Perimetre = 2 times the length + 2 times
the width = 2 (l + w) Callipers

Callipers are precision measuring
Acti vity 2.1 instruments characterized by two adjustable
Aim: To measure lengths of arms or jaws designed to measure the
different objects. dimensions of an object, such as its length,
Materials: metre ruler, tape width, thickness, or diameter. The device
measure, paper and pen can come in several types, including
vernier, and digital callipers, each offering

32
Student’s Book Form One

Physics Form 1 Final.indd 32 16/10/2024 20:55