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Measurement + Units

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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Measurement + Units

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  1. Measurement + Units

  2. 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)

  3. SI units + Symbols

  4. SI units + Symbols

  5. Measuring lenght • A metre stick or ruler measures straight lines

  6. Opisometer • An opisometer can be used to measure short curved lines for example a road or a river on a map

  7. Trundle Wheel • Used to measure long curved lengths for example around a flower bed

  8. 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

  9. 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?

  10. 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)

  11. 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

  12. 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

  13. 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

  14. 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

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