Post on 01-Jan-2016
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Unit 1
Measurement
1st Year Physics
Instruments of Measurement
• Ruler/Meter stick
• Stop Clock
• Thermometer
• Scales
• Measuring Cylinder
• Opisometer
• Trundle wheel
• Callipers
Basics Units in Physics
Length
Measuring Length.
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)
Opisometer
Task: Use an Opisometer & Ruler to work out the length of a curved line to the nearest cm
Trundle Wheel.
Task: Use a Trundle Wheel to measure the length of the corridor to the nearest metre (m)
Vernier Calipers
Callipers
Task: Use a callipers or a vernier calipers to measure the outside and inside diameter of a beaker in mm
Mass
Measuring Mass with a Scales
Mass is the amount of matter in a substance. Unit: Kilogram (kg).
Task: Calculate the mass of the liquid in a beaker in grams (g)
Temperature
To measure Temperatures.
ThermometerThermometer
Unit: Degrees Celsius (oC)Unit: Degrees Celsius (oC)Task: Use Thermometer measure the temperature of a beaker of fresh tap water.
Area & Volume
Area is the amount of surface that covers an object.
Area = Length x BreadthArea = Length x Breadth
52 mm52 mm
36 mm36 mm
A = L x B
A = 52 mm x 36 mm
= 1,872 mm2
Task: Measure the length and breadth of your copy and calculate its area in mm2
Volume is the amount of space taken up by an
object.Volume = length x breadth x height.Volume = length x breadth x height.
V = L x B x H36 mm36 mm
52 mm52 mm
15 mm15 mm
V = 36mm x 52mm x 15mm
V = 28,080 mm3
Task: Measure the dimensions of a block of wood (or matchbox) and calculate its volume in mm3
Example to calculate the volume of a matchbox
To measure the volume of a liquid
Measuring
Cylinder
Measuring
Cylinder
Liquid Volume is measured in:Litres (l) or Millilitres (ml)
Liquid Volume is measured in:Litres (l) or Millilitres (ml)
Meniscus
Read from bottom of
the Meniscus
Read from bottom of
the Meniscus
To measure the volume of a small object
Finishing VolumeFinishing Volume
Starting VolumeStarting Volume
The Increase in Volume is 25 mlSo this must be the Volume of the Stone
The Increase in Volume is 25 mlSo this must be the Volume of the Stone
To measure the Volume of an Irregular Object using an
Overflow-Can
Overflow CanOverflow Can
Measuring CylinderMeasuring Cylinder
Task: Use an overflow-can and measuring cylinder to work out the volume of a stone in ml