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Activator: True or false if false correct The basic particles of an atom are protons, neutrons , and nuclei. 2) Particles that make up an atom have No charge. 3) Electrons are negatively charged. Chapter 8 - Electricity. Vocabulary: Sections 1 and 2 Law of electric charges

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Presentation Transcript
slide1

Activator: True or false if false correct

The basic particles of an atom are

protons, neutrons, and nuclei.

2) Particles that make up an atom have

No charge.

3) Electrons are negatively charged.

slide3

Vocabulary: Sections 1 and 2

  • Law of electric charges
  • electric force
  • conduction
  • induction
  • conductor
  • insulator
  • static electricity
  • electric discharge
  • 9) grounding
  • 10) ion
slide5

All matter is composed of atoms

  • Atoms are made of
    • protons – positively charged particles
    • neutrons – particles with no charge
    • electrons – particles with a negative charge
slide6

3) A charged particle exerts a force

4) The Law of electric charges says that like charges repel and opposite charges attract.

slide7

5) The force between two charged objects is an electric force ;it can be

attractive or repulsive.

Its strength is determined by the size of the charge and the distance between the charges.

-the closer the objects

are, the greater the

charge

slide9

7) Normal atoms have NO charge.

They become charged when they gain or lose electrons. An atom becomes negatively charged when it gains extra electrons. If an atom loses electrons it

becomes positively

charged. A positively

or negatively charged

atom is called an ion.

slide10

8) There are three ways to charge an

atom:

induction

conduction

friction

slide11

9) Friction: rubbing two objects together may cause electrons to be “wiped” from one object to another

slide13

11) Induction: When a charged object is placed near a neutral object it may cause the particles in the neutral object to rearrange themselves.

slide14

12) Law of Conservation of charges: No charges are created or destroyed. Electrons move from one item to another

slide15

13) Conductors: charges move through easily

Insulators: charges do not move through easily

Ex: metals

slide17

15) Electric discharge: the loss of a charge – sometimes over time, or quickly as a spark or a shock.

slide19

17) Grounding- provides a pathway to drain excess charge into the Earth; lightning rods provide grounding for many

buildings.

slide20

Explore Static Electricity(mini lab)

How can materials interact electrically?

Hold the newspaper strips firmly together at one end and let the free ends hang down. Observe the strips.

Put the plastic bag over your other hand, like a mitten. Slide the plastic down the entire length of the strips and then let go. Repeat several times.

Notice how the strips of paper are hanging. Describe what you observe.

slide21

What do you think?

How did the strips behave before

step 2?

How did they behave after step 2?

How might you explain your

observations?