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Showing posts from July, 2011

Science: Types of Forces

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There are four types of forces:
GravitationalElectromagneticWeak NuclearStrong Nuclear

Science: Motion and Laws of Motion

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Science: Motion
Motion is an act of changing position with respect to a reference point.
It can be measured by:
speed (scalar quantity) – m/s, km/hr, mi/s (magnitude) velocity (vector quantity) – m/s eastward (magnitude direction) acceleration – m/s2, km/hr2
Laws of Motion

Law of Inertia
The resistance to change in motionLaw of Acceleration
directly proportional with force and inversely proportional with mass; a=F/mLaw of Interaction
for every action, there is equal / opposite reactionLaw of Universal Gravitation
G=6.67 x 10-11
F=GM1M2/d2
W=mg

Science: Astronomers and their Contributions

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Science: Astronomers and their Contributions
Ptolemy, Claudius – Geocentric model (earth-centered)Copernicus, Nicholaus – Heliocentric model (uniform circular motion)Tycho Brahe – astronomical instrumentJohannes Kepler – Law of Orbit, Law of Equal Areas, Law of PeriodGalileo Galilei – telescope, thermometer, compass, pendulum, satellite of JupiterIsaac Newton – Law of Inertia, Law of Acceleration



Science: Measurement

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Measurement is a process of comparing unknown quantity with a standard.

(7) Seven Fundamental Quantities
1. length – meter
2. mass – kilogram
3. time – seconds
4. temperature – Kelvin
5. amount of substance – mole
6. electric current – ampere
7. luminous – candela

Science: Scientific Method

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The Scientific Method
Identify the problemObservationSenses (quality)Measure (quantify)Gather data (table, chart, graph, diagram)Formulate the Hypothesis (wise guess)ExperimentIndependent variableDependent variableInterpretDraw ConclusionRecommendation/Application