Measurements

Angel Lyn
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Sec 1 Physics: Measurements

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Angel Lyn
Created by Angel Lyn over 4 years ago
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Measurements
1 Physical Quantities
1.1 A measurement of a certain characteristic or property of an object
1.2 Must consist of:
1.2.1 Magnitude
1.2.2 Units
1.2.2.1 SI units
1.2.2.1.1 International System of Units
1.2.2.2 Prefix
1.2.2.2.1 Represent extremely big/small measurements

Annotations:

  • Giga (G) --> 1 000 000 000 Mega (M) --> 1 000 000 Kilo (k) --> 1 000 Deci (d) --> 0.1 Centi (c) --> 0.01 Milli (m) --> 0.001 Micro (u) --> 0.000001 Nano (n) --> 0.000000001
2 Length
2.1 Distance between two points
2.2 SI unit: metre (m)
2.3 Measured with ruler, measuring tape, metre rule, vernier caliper
3 Area
3.1 2-dimensional surface
3.2 SI unit: square metre (m2)
3.3 Regular shapes
3.3.1 Rectangle = Length x Breadth
3.3.2 Triangle = 1/2 x Base x Height
3.4 Irregular shapes
3.4.1 Tracing onto grid paper
4 Volume
4.1 Space occupied by a body
4.2 SI unit: cubic metre (m3)
4.3 Regular objects
4.3.1 Cuboid = Length x Breadth x Height
4.4 Irregular objects
4.4.1 Displacement can / Eureka can
4.4.2 Displacement in measuring cylinder
4.4.2.1 Read bottom of meniscus at eye level to avoid parallax error
5 Mass
5.1 Amount of matter in a body
5.2 SI unit: kilogram (kg)
5.3 Measured with beam balance, electronic balance
6 Time
6.1 Duration from the beginning to the end
6.2 SI unit: second (s)
6.3 Measured using pendulum
6.3.1 Period is time taken for the pendulum to complete one oscillation

Annotations:

  • When the pendulum swings from one end to the other end and back, it makes one oscillation.
6.3.1.1 Longer pendulum, longer period
6.3.1.2 Lower gravity, longer period
7 Density
7.1 Mass per unit volume of a body
7.2 SI unit: kilogram per cubic metre (kg/m3)
7.3 Density = Mass / Volume
7.4 High density sink, low density float

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