General Physics 1
Quarter 1 – Lesson 1
Measurement in Physics
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Written Work (25%)
- Quizzes
- Seatwork / Practice drills
- Laboratory worksheet
• Quarterly Assessment (25%)
- Summative Test
- Periodical Examination
Performance Task (50%)
- Oral Recitation
- Group Activity
- Lecture Notebook
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Ice – Breaker:
2 thick books
colored paper
tape
coins
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At the end of the lesson, the learners will be able to:
Describe physical quantities and enumerate
different units of measurement
2. Differentiate accuracy from precision
3. Solve measurement problems involving
conversion of units, expression of measurements
in scientific notation
1.
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Physics deals with the interaction
of matter, force, and energy.
It
is the study of nature, the
understanding of its phenomena of
motion and how it behaves.
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Classical Physics
Modern Physics
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FORMULA - sets of mathematical symbol
representing facts, rule or principle.
EQUATION - used to represent
relationships
in
mathemathics,
represented by unknown variables.
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changing mathematical formula
to find the unknown variables.
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https://creativepro.com/scanning-around-gene-amazing-story-measurement/
1. How do you think people from the past
measured length, weight, time, and volume?
2. Are ancient ways of measurement still in use
today? Why?
3. Differentiate fundamental from derived
quantities.
4. As a student, give situations wherein you have
to use the concept or process of measurement.
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Physics is an experimental science. Physicists
observe the phenomena of nature and try to find
patterns that relate to these phenomena. These
patterns are called physical theories or physical
laws or principles when they are very well
established and widely used. Experiments require
measurements, and we generally use numbers to
describe the results of measurements.
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Physical Quantity
Value
Average mass of an
adult
70 kg
Room temperature
300 K
Average height of an
adult
1.7 m
Household microwave
power consumption
900 W
Energy in a teaspoon
of sugar
70 kJ
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Accuracy is defined as how
close a measured value to a
true or accepted value is.
Precision is defined as how
good a measurement can be
determined.
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Scientific Notation is a convenient and widely used method of
expressing large and small numbers. Any quantity may be
expressed in the form of N x 10 n, where N is any number between
1 and 10 and n is the appropriate power of 10.
Example:
1. The speed of light is approximately 300 000 000 m/s
300 000 000 m/s = 3 x 10^8 m/s
2. The mass of a strand of hair is approximately 0.000 000 62 kg.
0.000 000 62 kg = 6.2 x 10^-7 kg
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Step 1: Identify whether the number is large or small.
5 430 000 miles
Number is large
Step 2: Move the decimal point
a. If the number is greater than 10, move the decimal point to the left to create a new number ranging from 1
to 9.
b. If the number is less than 10, move the decimal point to the right to create a new number ranging from 1 to
9.
5 430 000 miles
Number is large therefore, move the decimal point to the left
Step 3: Write the base 10 and the exponent n, which signifies the number of times the decimal point was
moved.
5.43 x 10 ^6
Step 4: The exponent n is positive if the decimal point is moved to the left, it is negative of the decimal point is
moved to the right.
5.43 x 10 ^(+)6
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THE SIMPLEST WAY TO CONVERT ONE UNIT TO ANOTHER IS TO FORM A
CONVERSION RATIO (EQUAL TO ONE) WITH THE DESIRED UNIT ON THE
NUMERATOR AND THE UNIT TO BE CONVERTED AT THE DENOMINATOR. THE
ORIGINAL QUANTITY IS MULTIPLIED BY THIS CONVERSION RATIO. UNITS MAY
BE MULTIPLIED OR DIVIDED JUST LIKE ANY ORDINARY ALGEBRAIC FACTORS.
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USING THE FACTOR -LABEL METHOD:
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