34 Measurement and Units.notebook Mr. C JCS 1 January 14, 2014 Chapter 34 Measurements and Units Length is measured using a Metre stick, measuring tape, callipers, Vernier callipers, opisometer and Trundle wheel. Length is measured inmetres (m), millimetres mm, centimetres cm, and kilometers km. There are 1000 millimetres in a Metre 100 centimetres in a Metre and there are 1000 metres in a Kilometre. Opisometer measures curved lines Vernier Callipers measures spheres
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34 Measurement and Units.notebook
Mr. C JCS 1
January 14, 2014
Chapter 34 Measurements and Units
Length is measured using a Metre stick, measuring tape, callipers, Vernier callipers, opisometer and Trundle wheel.
Length is measured in metres (m),millimetres mm, centimetres cm, andkilometers km.
There are 1000 millimetres in a Metre 100 centimetres in a Metre
and there are 1000 metres in a Kilometre.
Opisometer measures curved lines Vernier Callipers measures spheres
34 Measurement and Units.notebook
Mr. C JCS 2
January 14, 2014
QUANTITY UNIT SYMBOL
Length Metre m
Mass Kilogram kg
Time Second s
Units and Prefixes
Temperature Celcius 0 C
34 Measurement and Units.notebook
Mr. C JCS 3
January 14, 2014
Callipers shaped like a C.Used for measuring the thickness of pipes or beakers.
Vernier Callipers shaped a little like a V.Used for measuring the thickness of round objects.A digital callipers tells us the size straight away.A manual callipers has to be read carefully.
The inside length is subtracted from the outside length and the result is divided by 2.
34 Measurement and Units.notebook
Mr. C JCS 4
January 14, 2014
0 1 2 3 4 5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 150°
Opisometer is used to measure curved lines. e.g. on a map.The wheel is placed next to the side with the point.The point is moved along the line and the wheel moves.The opisometer is then turned over and moved along a ruler.When the wheel stops we have the length of the curved line.
34 Measurement and Units.notebook
Mr. C JCS 5
January 14, 2014
Mass of an object is the amount of matter in it.
Mass is measured using an electronic balance.
It is measured in grams or kilograms , g or Kg
MASS
Your mass on the earth and on the moon are the exact same.This is because you're made of the same stuff here and there.Your weight will be different on the earth and moon as weight depends on gravity.
We weigh a solid to find its mass or we can weigh a liquid in a beaker.
Unit of Mass
34 Measurement and Units.notebook
Mr. C JCS 6
January 14, 2014
Time can be measured in seconds, s.Time
We use a stopwatch to measure time in the lab.The most accurate clocks are atomic clocks.Greenwich mean time is where all time on earthis measured from. Einstein had some interesting facts about Time.The faster we move the more time slows down.There is the twins experiment that explains this.
34 Measurement and Units.notebook
Mr. C JCS 7
January 14, 2014
The temperature of an object is a measure of how hot or cold the object is.
Temperature is measured using a thermometer and is measured in Celcius.
Thermometers used to have Mercury in them.Many now have alcohol that is coloured red.Digital thermometers are used in hospitals.
Temperature
Water freezes at 0OC and boils at 100OC.
Human Body temperature is 37oC.
34 Measurement and Units.notebook
Mr. C JCS 8
January 14, 2014
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