Measurement Units Measurements in Physics The most important

Measurements in Physics • The most important measurements in Physics are Length, mass and

SI units + Symbols Quantity Length Mass Time Area Volume SI Unit Symbol Other

SI units + Symbols Quantity SI Unit Symbol Other Units used Length Metre m

Measuring lenght • A metre stick or ruler measures straight lines

Opisometer • An opisometer can be used to measure short curved lines for example

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

Vernier Callipers • To find the diameter or width of a solid object for

Learning Check • • What units is length measured in? What units is mass

Measuring Area • Area is how much space something covers • A book has

Measuring the area of an irregular object • Your hand or a leaf does

Mass • Mass is the amount of matter in an object • It is

Measuring Volume • Volume tells you how much space something takes up • It

Measuring volume of irregularly shaped objects • A stone or a potato does not

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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 Quantity Length Mass Time Area Volume SI Unit Symbol Other Units used

SI units + Symbols Quantity SI Unit Symbol Other Units used Length Metre m km, cm, mm, Mass Kilogram Kg Gram (g) Time Second S minute (min) Hour (h) Area Square metre m 2 cm 2, km 2 Volume Cubic metre m 3 cm 3, Litre (L)

Measuring lenght • A metre stick or ruler measures straight lines

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

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

Vernier Callipers • To find the diameter or width of a solid object for example marble or a piece of piping • Click here to see how it works

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 • 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 m 2 (or cm 2 , km 2 or mm 2)

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 1 mm 2

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 • Volume tells you how much space something takes up • It is measured in m 3 (or cm 3, ml or litres) • For a regular object such as a cardboard box Volume = Length X width X Height

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