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Chapter 18

Chapter 18. Physics A First Course. Electricity and Magnetism. Electricity and Magnetism Fields and Forces. 18.1 Fields and Forces 18.2 Gravity 18.3 The Electric Field. Key Question: Does magnetic force spread out in a the area around a permanent magnet?.

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Chapter 18

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  1. Chapter 18 Physics A First Course Electricity and Magnetism

  2. Electricity and MagnetismFields and Forces • 18.1 Fields and Forces • 18.2 Gravity • 18.3 The Electric Field

  3. Key Question: Does magnetic force spread out in a the area around a permanent magnet? 18A Investigation: The Magnetic Field *Students read text section 18.1 AFTER Investigation 18A

  4. 18A Investigation Topics • Use a compass to map a magnetic field. • Map out an electric field. • Map out a gravitational field.

  5. Propose a general explanation for how forces act over a distance. Describe why the strength of a field decreases with distance from the source. Describe how fast a force moves between objects. Chapter 18.1 Objectives and Vocabulary • field • intensity • inverse square law

  6. Sound Intensity vs. Distance

  7. Fields and Energy

  8. Inverse Square Law Light intensity (brightness) decreases by 1/4th as the distance from the source is doubled because the same amount of light energy is dispersed over a greater area (4 times greater).

  9. gravitational field force field Describe how gravity acts between objects through a field. Calculate the gravitational field on other planets. Chapter 18.2 Objectives and Vocabulary

  10. Key Question: What does a field tell you about what created it? 18B Investigation: Using Fields *Students read text section 18.3 AFTER Investigation 18B

  11. 18B Investigation Topics • Use a compass to map the magnetic field of a hidden magnet. • Use magnetic field map to find the location of a hidden magnet. • Use magnetic field map to find the orientation of a hidden magnet.

  12. electric field source charge shielding Describe how the electric charges act in an electric field. Calculate electric field strength. Chapter 18.3 Objectives and Vocabulary

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