1.1 understanding physics.ppt
TRANSCRIPT
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PHYSICSFORM 4
Chapter 1Introduction to PhysicsBy: Wan A’isyah Wan Mahdi
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What is PHYSICS??
●Branch of science concerning the study of natural phenomena, properties of matter and energy also the connection between them.●Physics – Come from the Latin word physica meaning the science of natural things.●19th century – natural philosophy.●Experimental observations and quantitative measurements.
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Natural Phenomena??
●Lightning and thunder.●Sea waves and tides.●Rain and sunshine.●Earthquake and hurricane.
LightningLightning is electric current
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This parabolaThis parabola-shaped lava flow illustrates GalileoGalileo's law of falling bodies as well as blackbody radiation – you can tell the temperature from the color of the blackbody.
Cassiopeia ACassiopeia A – a sphericallyCassiopeia A – a spherically symmetric remnant of the 1680 supernova
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The astronaut and Earth are both in free-fall
DispersionDispersion of lightDispersion of light by a prism
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Everyday Objects?
●List an everyday objects around you.1)2)3)How they are related to physics concept?●Made based on physics concepts.●By theories and experiments.●Numerical analysis, calculus, computer simulations ( technology).
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Physics is Quantitative
●Experimental results in physics are numerical measurements and theories.●Use mathematics to give numerical results to match these measurements.
What is the differences between physics and math?
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●PHYSICS ●Ultimately concerned with descriptions of the material world, it tests its theories by comparing the predictions of its theories with data produced from the observations and experimentation.
●MATHEMATICS- Concerned with abstract logical patterns, not limited by those observed in the real world.
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Fields of study in Physics
Forces and MotionNuclear physics
Heat
ElectronicsLight
Electricity andelectromagnetism Waves
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1.4 Understanding Measurement
●Choosing an appropriate instrument to measure a physical quantity is important to
ensure that the measurement is accurate and reproducible.
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Common Measurement Instrument
●Measurement tape- measure length of several metres.
- accurate up to 0.01 m.●Metre rule – measure lengths of a few centimetres to a metre.
- accurate up to 0.1 cm
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●Vernier callipers – measure lengths of less than 10 cm.
- suitable for measuring internal or external
diameter of round object - accurate up 0.01 cm
●Micrometer screw gauge- measure the very small readings. - accurate up to 0.01 mm.
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Consistency and Accuracy
●Consistency-ability of the instrument to measure a
quantity with little or no deviation among the measurement. ●Accuracy
- actual value or the nearer to the actual value.
- how close the measurement to the actual value.