Measurment
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What is length?
Length is the distance between 2 points
What is the SI unit for length?
Meters
What instruments do we use to measure length?
Opisometre,trundle wheel,ruler,metre stick, veneer calipers
What are the units?
Millimetres (mm) Centimeters (cm) meters (m) kilometres (km)
What is the function of veneer calipers?
To measure the diameter of a circular object e.g. coin
What is the function of a trundle wheel?
To measure a long curved line
What is the function of a opisometer?
To measure the length of a curved line for a short distance e.g. road on a map
What does accuracy mean?
How close a measured value is to it’s actual value
What could lead to errors in a measurement result?
Parallax error and zero error
What does parllax error mean?
reading the measurement from incorrect angle
What is a zero error?
When you don’t start at zero on a measurement instrument
How many mm are in a cm?
10
How many mm are in a m?
1000
How many cm are in a m?
100
How many m are in a km?
1000
How do you convert cm into M ?
Divide by 100
How do you convert M to cm?
X by 100
How do you convert km to m?
Multiply by 1000
How do you convert M to km ?
Divide by 100
How do you convert mm to m?
Divide by 1000
How do you convert mm to m?
Multiple by 1000
What is area?
The area of an object is the amount of surface inclosed within its lines
How do you calculate area?
Multiple length by width
How do you calculate the area of an irregular shape?
Trace the outline of the shape onto grid paper then count total boxes (each box is 1cm2, boxes less then have aren’t counted but over half is counted as 1cm2. Box half filled count as 0.5cm2