The World of PHYSICS…What is a Physicist?- is the one that studies physics. A physicist should also be

“B-O-R-I-N-G…?!”; an acronym which means…

B – elieves in a Cause-And-Effect RelationshipO – pen-mindedR – espects the ideas of othersI – maginativeN – aturally curiousG – enerates opinions based on evidence

The World of PHYSICS…Physics has been the best contributor of breakthroughs in science. In fact, it made into realities the hypothetical imaginations of the past.All of these were through due to the methodology used by physicists and discoverers… and this method is…

SCIENTIFIC METHOD.Scientific method is a systematic

way of solving problems.*systematic means following a

step or procedure.

The World of PHYSICS…

*Steps in Scientific Method includes the following:

1. Identifying the PROBLEM.2. Formulating HYPOTHESIS.3. TESTING the hypothesis.4. Analyzing and verifying

RESULTS.5. Formulate CONCLUSIONS

and RECOMMENDATIONS.

The World of PHYSICS…In physics, we will be concerned with how quantities changes as

other quantities varied. These are quantity relationships which are

mathematical and formulate equations using basic concepts

on variations.These relationship variations are

as follows:1. Direct Relationship2. Inverse Relationship3. Direct – Square Relationship4. Inverse – Square Relationship

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The World of PHYSICS…Direct Relationship Variation.

Two variables x & y are directly proportional to each other if their ratio is constant. In mathematical

formula,y = kx

where k is the constant of variation. If x is doubled, the value

of y is also doubled.The graph of a direct relationship is a straight line passing through the

origin with a slope equal to the constant of variation k. It is also

known as a linear graph.

.

The World of PHYSICS…This is an example of Direct Relationship Variation.

Graph of Force VS. Elongation

Elongation (x) in centimeters (cm)

8.08.06.06.04.04.02.02.0

00 1.1. 00 2.2. 00

Forc

e (F

) in

Newt

on (N

)

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The World of PHYSICS…

Inverse Relationship Variation.A variable y is inversely

proportional to x if the product of x and y is a constant. Mathematically

expressed as…xy = k

As the value of x increases, the value of y decreases

proportionately so that their product is a constant. For example,

doubling the value of x; cuts the value of y into half. The graph of this relationship is a hyperbola.

The World of PHYSICS…This is an example of an Inverse Relationship Variation.Graph of Force VS. Elongation

Mass (m) in kilograms (kg)

1010

55

00 1.1. 00 2.2. 00Acce

lera

tion

(a)

in m

/s2

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AcceleratioAcceleration (m/sn (m/s22))

10.10.00

5.05.0

Mass (kg)Mass (kg) 1.01.0 2.02.0

The World of PHYSICS…

Direct Square Relationship Variation.

A variable y is directly proportional to the square of x if the ratio of y

the square of x is constant. Mathematically expressed as…

y = k x2

where k is the constant of variation. If you double the value of

x, the value of y will be quadrupled. The graph of this relationship when plotted is a

parabola.

The World of PHYSICS…This is an example of Direct Square Relationship Variation.

x2

y

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