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Published byTrey Satterthwaite Modified over 10 years ago
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demos Intro: electricity is gonna be big
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Ac/Hon Physics Notes Chapter 20 Electostatics
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Lesson 1 Definitions and concepts
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Objectives At the end of this lesson you will be able to: – Define electric charge and explain how forces act between charged objects
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Electricity! Electricity: – Flow of electrons Electrostatics – Study of electrons (and protons) standing still
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The Atom and Electric Charges Electrons – Negative charge Protons – Positive charge
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Electrostatic Force Like charges repel each other Unlike charges attract each other The attraction or repulsion is called: – Electrostatic Force It is a force like all other forces we’ve studied in this class – Units = ?? – Newtons
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Electrostatic Force vs. Gravity Electrostatic ForceGravitational Force Field force Force due to electric chargeForce due to mass Can repel or attractCan only attract
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Other fun facts All Electrons and protons are the same regardless of what kind of atom
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Questions What is electric charge? What causes electrostatic force? Why do like charges repel and vice versa? – Electrostatic Force Stop asking so many questions. We have no idea. Just accept it
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How do we measure electric charge? Coulombs (C) – Charles-Augustin de Coulomb (1736-1806) Charge of an electron or proton e = 1.602 × 10 -19 C + for proton -for electron How do we get more charge (more Coulombs)? Add more electrons or protons Wait – do we ever add protons? We’ll get to this later….
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What is the electrical charge of an atom? Zero It has the same # of protons and electrons Zero charge Charge Neutral
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How do we give something a charge? Add or take away electrons – Protons don’t move Adding electrons – Gives negative charge Removing electrons – Gives positive charge Atoms with a missing OR extra electron are called: – Ions
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Conductors and Insulators Conductors – Electrons move easily through Insulators – Electrons stay put
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Charge Conservation Electrical charge can never be created or destroyed It only moves
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Lesson 2 Charging objects
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Objectives At the end of this lesson you will be able to: – Solve problems involving moving of charge
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Lesson 2 Charging objects
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Objectives At the end of this lesson you will be able to: – Solve problems involving moving of charge
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Ways things get charged Conduction – 2 things touch and electrons move Induction – 2 things come close to each other and electrons get pushed or pulled – we’ll explain this more soon…
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What electrons like to do If there is no force on them, electrons spread out evenly
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What’s up with “Ground” Earth is big It has a lot of electrons – really a lot If a charged object comes in contact with the earth, it automatically becomes neutral We say this object has been “grounded” Explain why…
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Charging Problems Do on board – A charged object comes in contact with a charge neutral object (pos and neg) – A charged object come near a charge neutral object that’s grounded and the ground is removed.
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Why will a charged object attract a charge neutral object like in the paper and ruler demo Do on board
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Electorsopes A tool that tells you when it is charged. Do on board
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Lesson 3 Coulomb’s Law
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Objectives At the end of this lesson you will be able to: – Apply Coulomb’s Law
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Coulomb’s Law
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