measuring length
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what’s an opisometer?
used to measure short curved lines
what’s a trundle wheel?
used to measure long distances
what’s a ruler/meter stick used for?
used to measure short lengths
What’s a Vernier callipers?
Used to measure a diameter of an object
What is area
The amount of space in a 2D object
How do you find the area of a rectangle or square?
Length x width
How do you find the area of a circle?
If the radius is 6 inches, to find the area you must multiply 6 by itself then multiply it by pi e.g. 6x6=36, 36x3.14=113.04 inches squared.
How do you find the area of a triangle
1/2 b x h, if the base is 5cm, you do 5x5, next you 1/2 you answer e.g. 25 divided by 2= 12.5cm squared.
How do you find a length if the width & area is given?
For example, you get the width then divide it by the area; w= 1350mm squared divided by 25mm=0.984 in 54mm squared
What’s the difference between mass and weight?
Mass is a measurement of how much matter there is in an object, weight is a measure of the size of the pull of gravity on the object.
How do you find the volume of an object?
l x w x h
how do you find the volume of liquid?
Measure using a graduated cylinder.
How do you find the volume of an irregular shape?
First irregular shapes, we use water displacement. We measure the water in a graduated cylinder, we then place the object in the graduated cylinder. Measure how much the volume of the water has gone up on the side.
What is mass?
Mass is the amount of material in an object.
What do you use to measure mass?
Mass balance, scale
What’s the formula for density?
mass divided by volume