This document discusses tools used for measurement in science class. It focuses on metric rulers and how to accurately measure length in centimeters and millimeters. Key points include:
- Measurements are observations made using tools like rulers, while calculations involve manipulating measured numbers with formulas.
- When calculating, measurements must use the same units (e.g. cannot mix cm and mm without converting).
- When measuring with a ruler, start from the black line not the edge, and read measurements between the black lines in mm up to the next cm line.
- Mass and weight are different - mass is the amount of matter, while weight depends on gravity.
The Earth pulls all objects to its centre. This pull is called the force of gravity or gravitational force.
The weight of an object is the pull of the Earth on the object.
The Earth pulls all objects to its centre. This pull is called the force of gravity or gravitational force.
The weight of an object is the pull of the Earth on the object.
This is a educational presentation taking the participant through the evolution of Mathematical concepts of numbers, zero, decimal and infinity in a cogent, easy to understand way. Created for the author's project of knowledge sharing with children of secondary grade through one day in situ workshops.
Prepared by Debjyoti Bhattacharyya
This is a educational presentation taking the participant through the evolution of Mathematical concepts of numbers, zero, decimal and infinity in a cogent, easy to understand way. Created for the author's project of knowledge sharing with children of secondary grade through one day in situ workshops.
Prepared by Debjyoti Bhattacharyya
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2. (The things we use to make
observations in a science class.)
Tools of Measurement
3. Measurement
• A measurement is an observation that we
make using a tool (meter stick, graduated
cylinder, triple beam balance, etc.).
• When we calculate something like volume,
we first take measurements then
manipulate the numbers using a formula.
• We can MEASURE the volume of a liquid
but we CALCULATE the volume of a box!
4. Measurement
****Always remember – if you are going
to do a calculation using your
measurements, you must always use the
SAME UNITS for each measurement –
you cannot multiply cm and mm – you
must first convert one to the other!
****
6. How do you measure with a metric
ruler?
• Always start with the black line, not the edge
of the ruler.
• Use the side of the ruler with cm or mm.
7. Using a Ruler
• Count the whole numbers and then the
remaining black lines.
• Each individual black line represents 1 mm.
There are 10 black lines between each cm.
8. Using a Ruler
• Hold the zero - all answers must have a value
in the tenth decimal point position (4.0 mm, 25.1
cm).
• Do not use fractions to record answers.
12. Mass versus Weight
• Mass and weight are NOT the same thing.
• Mass – the amount of matter in an object
13. What is weight?
• Weight – is the measure of the pull of
gravity on an object.
14. Example:
•The moon is 1/6 of the
Earth’s gravity.
•Weight will be 1/6 of
what it is here on Earth
(divide by 6).
•However, their size will
not change!
•A person will not
physically shrink to 1/6
their size if they go to
the moon!
