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Girls in STEM
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RESPECT FOR WOMEN IS PARAMOUNTNetworking
LENGTH
Length is the measurement of distance from one point to another.
The standard unit of length is a metre [m].
Other units include;-
– Kg, cm,
– Mm, dm etc
Where
1km = 1000m
1m = 1000mm
CONVERSIONS
Convert as required
1m = 1000mm
34m = 34 x 1000
= 34,000mm
1 km = 1000m
1m = 1/1000
34m = 1/1000 x 34
= 34/1000
= 0.034km
1km = 1,000,000mm
10.04km = 1004/100 x 1,000,000
= 10,040,000mm
1km = 1000m
10.04km = 1004/100 x 1000
= 10,040m
1m = 1000mm
520m = 520 x 1000
= 520,000mm
1km = 1000m
= 520m
520/1000 X 520m
= 0.52km
INSTRUMENTS USED TO MEASURE LENGTH
– Tape measure
– Meter rule
– Vermeer caliper
– Micrometer screw gauge
THE METER RULE
It is used to measure straight lines, widths and heights of objects.
When using a meter rule;-
Take readings from position B, where the eye is vertically above the mark.
When meaning length of curved objects, a string of thread will be used;
THE MICROMETER SCREW GAUGE
This is used for measuring very small lengths such as the width of a meter rule, the diameter of a wire e.t.c
Reading is taken to the second decimal place of a millimeter [mm]. The object whose length is to be measure in fitted between the anvil and spindle by adjusting the rate let.
Precautions
Before using a micrometer screw gauge;-
I – Wipe the faces of the anvil and spindle to remove any dirt particles that may cause false readings.
II – incase of any zero error, he zero reading must be checked, corrected and correction made in the final answer.
HOW TO USE THE MICROMETER SCREW GAUGE
The object is placed between the spindle and the anvil while turning thimble.
When the spindle gets very close to the object, the ratchet is turned until a click is heard
There are two reading to take;-
– sleeve reading
– Thimble reading
Each division on the thimble represents 0.01mm on a 100 divisions micro meter screw gauge. It is accurate to 3 decimal places in cm or 2 decimal places in millimeters
VENIER CALIPERS
This is adjusted to touch the two ends of an object, and then transferred to a ruler
The venier caliper consists of two scales;-
i- Centimeter scale
ii- Millimeter scale
The scale on the form is normally in cm, while that on the sliding jaw consists of 10 divisions in mm.
The venier caliper is used where a ruler may not be used e.g measuring the inner and outer diameters of round objects like a beaker, a tube , the thickness of a table e.t.c
When reading the veneir caliper, two sets of reading are considered;-
i- Reading on the main scale
ii- Reading on the venier scale
Two points on the vernier scale should be used to correct the right reading;-
i- The zero mark
ii- The point where a mark on the vernier scale coincides with the mark on the main scale
READINGS ON THE MICROMETER SCREW GAUGE
White down the readings show below
ASSIGNMENT : LENGTH assignment MARKS : 10 DURATION : 1 week, 3 days