Electrostatics Fundamental Forces Model of the atom Unit of charge

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Presentation transcript:

Electrostatics Fundamental Forces Model of the atom Unit of charge Charge is conserved Charge is carried by the electron

Research Challenge You have 5 minutes to find out what you can! What are the four fundamental forces of the universe? Briefly describe how two of them work. http://www.online-stopwatch.com/large-stopwatch/

4 Fundamental Forces of the Universe What causes gravitational force? MASS! Gravity Electromagnetism Nuclear Strong Force Nuclear Weak Force What causes the electric force? CHARGE!

S.I. Fundamental Units q C x m t s kg charge coulomb Quantity Quantity symbol Unit Unit symbol distance x meter m time t second s mass kilogram kg charge q coulomb C Make a table showing symbols, etc.

The Atom Electrons Neutron Proton charge in a proton = charge in an electron - - Electrons Attract AND Repel! Unlike charges attract (+, -) Like charges repell (+,+ or -, -) Proton Neutron Net Charge atom is neutral if number of protons = number of electrons “+” if the atom is missing electrons (it is called an ion) “-” if the atom has extra electrons + + nucleus Charge is conserved not created or destroyed, moves from place to place Bohr Model of the Atom

One atom says to the other atom, “I’m missing an electron!”. The other atom says, “Are you sure?” The first atom replies… “I’m positive”

How Does Charge Move? It is the electron that carries charge In a solid, the nucleus is fixed in place. + + + + + + + + + + + + + + + + + + It is the electron that carries charge + +