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Intro to Physics – Matter & Energy http://www.aplusphysics.com/courses/honors/intro/matter_energy.html Unit #2 Kinematics
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Objectives and Learning Targets Understand the question, “What is Physics?” Identify and explain several disciplines within the study of physics Define mass, matter, work, and energy Unit #2 Kinematics
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What is Physics? Book definition has to do with… matter energy interactions But, the real question is “Why?” Examples: Why is the sky blue? Why do objects fall? Unit #2 Kinematics
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Matter… Matter – anything that has mass and takes up space Think of it as the amount of “stuff” in something Examples of matter: solids (rocks, metals, etc.), liquids (water, vinegar, etc.), gases (helium, nitrogent, oxygen), plasma (sun, stars) Unit #2 Kinematics
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Sample Problem #1 Unit #2 Kinematics
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Sample Problem #1 Unit #2 Kinematics
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Types of Mass Unit #2 Kinematics Inertial Mass – an objects resistance to being accelerated by a force The more inertial mass, the harder it is to accelerate the object of interest Gravitational Mass – the amount of gravitational force experienced by an object The more gravitational mass, the more gravitational force Both types of mass are generally equal for practical purposes
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Energy Energy – often defined as the ability to do work or make a change in something What is Work? Work – the process or capacity to move an object Both definitions are vague, because energy is often difficult to define Unit #2 Kinematics
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Mass-Energy Equivalence Scientists around the turn of the century proposed a strong relationship between matter and energy 1905 Albert Einstein formulated E=mc 2, which show matter and energy are really one in the same Led the way to nuclear energy, nuclear weapons, particle colliders, etc. Unit #2 Kinematics
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Galileo - 1609 developed a systematic method of observing, experimenting, and analyzing…the scientific method B. no set method – but scientists started to systematically analyze problems, along with keeping detailed records Unit #2 Kinematics
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