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Introduction to Physical Science - Ballard Christian...
Transcript of Introduction to Physical Science - Ballard Christian...
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Introduction to Physical Science
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1.1 Introduction to Matter and Energy
• Physical Science
• An area of science that deals with non living materials and how they work
• Astronomy
• Physics
• Chemistry
• Earth sciences
• Deals primarily with matter and energy
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1.1 Introduction to Matter and Energy
• Matter
• Described as the substance of the physical world
• Can be tasted, touched, or smelled
• Examples of things that are non-matter
• Time, sound, light, gravity, thoughts, reflections, energy…
• Inertia
• Property of matter that makes it resist changes in motion
• “a body on motion will stay in motion, a body at rest will stay at rest”
• The more matter that forms an object, the greater its inertia
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1.1 Introduction to Matter and Energy
• Energy
• The ability to do work
• Forms of energy
• Light energy
• Thermal energy
• Chemical energy
• Mechanical energy
• Electrical energy
• All energy causes changes in matter
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1.1 Introduction to Matter and Energy
• Physical properties of matter
• Can be observed without changing the composition of matter
• Is used to describe matter
• Appearance, texture, color, odor, melting point, boiling point, density…
• Mass
• The amount of matter in an object
• The amount of inertial an object has
• It constant unless the object itself loses or gains matter
• Weight
• Amount of gravitational pull on an object
• Varies from place to place
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1.1 Introduction to Matter and Energy
• Volume
• Amount of space matter takes up
• Density
• The mass in a certain volume
• Indicates how tightly packed the matter is
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1.1 Introduction to Matter and Energy
• States of Matter
• Solid
• Has a definite shape
• Liquid
• Has constant volume
• Gas
• Has no fixed shape or fixed volume
• Plasma
• Special type of gas that exists at high temperature
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1.1 Introduction to Matter and Energy
• Chemical properties
• The properties of a substance describing how it changes when reacting with other substances
• Chemical change changes the type and identity of matter
• After a chemical change a new substance will have its own physical and chemical properties different from the original substance
• Examples
• Toxicity
• Flammability
• Stability…
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1.1 Introduction to Matter and Energy
• Branches of Physical Science (studied this year)
• Physics
• Study of interactions between matter and energy
• Mechanics
• Thermodynamics
• Acoustics
• Optics…
• Chemistry
• Study of the composition and interaction of matter
• Organic
• Inorganic
• Physical
• Biochemistry
• Analytical
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1.2 The Scientific Method
• Observe
• Research
• Hypothesis
• Plan/Design Experiment*
• Perform Experiment
• Collect/Analyze Data
• Conclusion
• Publish Research*
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1.2 The Scientific Method
• Hypothesis
• An educated guess
• Theory
• An hypothesis that passes the test of many experiments with the support of other scientists
• Scientific law
• A theory that is verified by enough observations and experiments and stands the test of time
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1.2 The Scientific Method
• Hypothesis
• Predictions
• Testability
• Repeatability
• Principle of Causality
• Law of cause and effect
• Events observed in the universe have rational causes