Unit 1 Measurement

1
Unit 1Measurement
1st Year Physics
2
Instruments of Measurement

• Ruler/Meter stick
• Stop Clock
• Thermometer
• Scales
• Measuring Cylinder
• Opisometer
• Trundle wheel
• Callipers

3
Basics Units in Physics
4
Length
5
Measuring Length.
6
Using a Ruler/Metre RuleCan you spot any error
being made in measuring this wire?
Task Use a ruler/meter rule to measure the
length and breath of your copy in millimetres (mm)
7
Opisometer
Task Use an Opisometer Ruler to work out the
length of a curved line to the nearest cm
8
Trundle Wheel.
Task Use a Trundle Wheel to measure the length
of the corridor to the nearest metre (m)
9
Vernier Calipers
10
Callipers
Task Use a callipers or a vernier calipers to
measure the outside and inside diameter of a
beaker in mm
11
Mass
12
Measuring Mass with a Scales
Mass is the amount of matter in a substance.
Unit Kilogram (kg).
13
Task Calculate the mass of the liquid in a
beaker in grams (g)
14
Temperature
15
To measure Temperatures.
Thermometer
Unit Degrees Celsius (oC)
Task Use Thermometer measure the temperature of
a beaker of fresh tap water.
16
Area Volume
17
Area is the amount of surface that covers an
object.
52 mm
Area Length x Breadth
A L x B
36 mm
A 52 mm x 36 mm
1,872 mm2
Task Measure the length and breadth of your copy
and calculate its area in mm2
18
Volume is the amount of space taken up by an
object.
Volume length x breadth x height.
Example to calculate the volume of a matchbox
V L x B x H
36 mm
52 mm
V 36mm x 52mm x 15mm
15 mm
V 28,080 mm3
Task Measure the dimensions of a block of wood
(or matchbox) and calculate its volume in mm3
19
To measure the volume of a liquid
Measuring Cylinder
Liquid Volume is measured in Litres (l) or
Millilitres (ml)
20
Meniscus
Read from bottom of the Meniscus
21
To measure the volume of a small object
Finishing Volume
Starting Volume
The Increase in Volume is 25 ml So this must be
the Volume of the Stone
22
To measure the Volume of an Irregular Object
using an Overflow-Can
Overflow Can
Measuring Cylinder
Task Use an overflow-can and measuring cylinder
to work out the volume of a stone in ml