Measurement + Units

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# Measurement + Units - PowerPoint PPT Presentation

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

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
• 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
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 m2 (or cm2 , km2 or mm2)
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
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 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
• 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