2. >
> And to measure distance, you have to use appropriate
tools.
3. ANCIENT TOOLS FOR MEASURING DISTANCE
length of actual foot, width of a finger, and
the distance of a step
– used distance from a person’s elbows to
his/her fingertips as a cubit measure.
– used distance from the tip of their thumb to the tip
of their index finger, which have been stretched apart, to
measure things, and they called this measure a lick.
– expressed length in span, which is the
length of a hand stretched out. A yard was originally the
length of the belt of an average adult male.
4. The International System of Units
Another units are centimeter (cm), and millimeter (mm) –
less than one meter. Kilometer (km) – exceeding one meter.
The following shows how the units are related to each
other:
1 meter = 1000 millimeters = 0.001km
1 meter = 100 centimeters
1 centimeter = 10 millimeters = 0.01 m
1 kilometer = 1000 meters = 100, 000 cm
5. Conversion From One Unit to Another:
Ex:
1. 3 m = ______ cm
3 x 100 = 300
3 m = 300 cm
2. 2.5 cm = ______ m
2.5 x 0.01 = 0.025
2.5 cm = 0.025 m
Ex:
3. 4 km = ______ m
4 x 1000 = 4000 m
4 km = 4000 m
4. 5.5 cm = ______ mm
5.5 x 10 mm = 55
5.5 cm = 55 mm
6. Tools for Measuring Length
A long and straight, and takes
measurements in inches, feet,
millimeters, and centimeters.
It may be made of wood, plastic,
or metal.
Meter stick – special ruler that is
exactly 1-meter long.
Yard stick – ruler that measures
nearly 1-meter long
7. 2. Tape Measure
Also referred as measuring
tape
A flexible ruler
Printed on a plastic ribbon
that can be used to find the
length around objects or the
distance along a wavy line.
It is frequently used in the
textile industry for taking
clothing measurements.
8. 3. Micrometer
Used to measure small objects
because it can measure lengths
within a quarter of a millimeter.
4. Odometer
Measures long distances such as highway travel.
Also called odograph, it indicates the distance
traveled by a vehicle, such as bicycle or an
automobile.
It is installed in the vehicle.
It can be electronic, mechanical, or a
combination of two.
9. 5. Satellite and Laser Range Finder
A high-tech equipment that are
used to measure distance over
long ranges, such as airplanes
and ocean liners.
10. 5. Measuring Wheel or Surveyor’s Wheel,
Click Wheel, Perambulator
– is a tool used to
measure distances.
Measuring wheels have
a counting mechanism
that counts the number
of rotations and uses the
circumference of the
wheel to calculate the
distance covered.
Measuring Wheel
Click Wheel
11. perambulator
An , also called a ,
meilograph, or map measurer, is an
instrument for measuring the lengths of
.
6. Curvimeter
12. 7. Caliper
A caliper - is a type of measuring tool that measures the
distance between two opposite sides of an object.
Calipers are meant for measuring thicknesses and internal
or external diameters inaccessible to a scale.
