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Measurement + Units. Measurements in Physics. The most important measurements in Physics are Length , mass and time To make sure everybody in the world can understand each other we all use the same units called SI units (Systeme Internationale). SI units + Symbols. SI units + Symbols.

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measurements in physics
Measurements in Physics
  • The most important measurements in Physics are Length, mass and time
  • To make sure everybody in the world can understand each other we all use the same units called SI units (Systeme Internationale)
measuring lenght
Measuring lenght
  • A metre stick or ruler measures straight lines
opisometer
Opisometer
  • An opisometer can be used to measure short curved lines for example a road or a river on a map
trundle wheel
Trundle Wheel
  • Used to measure long curved lengths for example around a flower bed
vernier callipers
Vernier Callipers
  • To find the diameter or width of a solid object for example marble or a piece of piping
  • Click hereto see how it works
learning check
Learning Check
  • What units is length measured in?
  • What units is mass measured in?
  • What units is time measured in?
  • How would you find the length of a short curved line?
  • How would you find the distance from here to the shop?
measuring area
Measuring Area
  • Area is how much space something covers
  • A book has a smaller area than a field
  • To get the area of a regular shape (a square or a rectangle) multiply the length by the width
  • Remember Area = L X W
  • Area is measured in metres squared m2 (or cm2 , km2 or mm2)
measuring the area of an irregular object
Measuring the area of an irregular object
  • Your hand or a leaf does not have a regular shape
  • To get the area of an irregular object trace it onto graph paper and count how many squares it covers, each square has an area of 1mm2
slide12
Mass
  • Mass is the amount of matter in an object
  • It is measured in the lab using an Electronic balance
  • Usually measured in

Kg or g

measuring volume
Measuring Volume
  • Volume tells you how much space something takes up
  • It is measured in m3 (or cm3, ml or litres)
  • For a regular object such as a cardboard box

Volume = Length X width X Height

measuring volume of irregularly shaped objects
Measuring volume of irregularly shaped objects
  • A stone or a potato does not have straight edges, it is irregular
  • We can measure the volume of irregular objects using a graduated cylinder and/or an overflow can