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Chapter 2

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Chapter 2

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  1. Chapter 2 8th Grade

  2. VOCABULARY • LESSON 1: • Magnet • Magnetism • Magnetic Pole • Magnetic Force • Conductor • Force

  3. magnet

  4. Magnet Every magnet, regardless of its shape, has two magnetic poles. North & South

  5. Opposites attract Magnetic poles that are unlike attract each other. Magnetic poles that are alike repel each other.

  6. What are magnets attracted to? Iron

  7. Pop quiz

  8. Pg. 46-47 • Maglev Video • Magnets keep train on track

  9. A maglev train floats above its rails due to magnetism.

  10. Untamed Video

  11. Pg. 48 • Magnetic Force- the attraction or repulsion between magnetic

  12. Force- a push or pull that can cause an object to change its motion

  13. Magnetic Field • A magnetic force is produced when magnetic poles are intact • The is a picture of the invisible “magnetic fields”. Someone poured “iron fillings” on top of the magnet for them to appear. • Magnetic field is spread out and curved

  14. Magnetic Pole- an end of a magnetic object, where the magnetic force is “strongest”The farther away the weaker the force is

  15. Students did Lesson 1 and workbook alone.

  16. Lesson 2 Vocabulary • Magnetic Field • Magnetic Field Lines • Compass • Magnetic Declination

  17. Pg. 59 1a. Define a magnetic field. 1b. Describe the magnetic field of a south/south pole arrangement.

  18. compass • Compass- is a device that has a magnet on a needle that spins freely • Does a compass always point North?

  19. A compass behaves as it does because the EARTHacts as a giant magnet.

  20. https://www.youtube.com/watch?v=Aq8s2SF17zY • https://www.youtube.com/watch?v=x4-a2PJIrpY • https://www.youtube.com/watch?v=qzFurCvvbvE

  21. The compass needle doesn't point toward the earth's North Pole, it is aligned with the local field lines, which may not even point to the magnetic North Pole.

  22. The poles of a magnetized compass needle align themselves with Earth’s “North Magnetic Field” not necessarily the “North Pole”. • However, they are close enough to get you towards the right direction.

  23. Magnetic Declination • The difference between the magnetic poles and geographic poles.

  24. Free Test question • As Earth’s magnetic poles move, the magnetic declination in a given location will change.

  25. Do the math pg. 61

  26. Quiz 1 • What does a North & North magnetic pole do? • What does a North & South magnetic pole do? • Magnet • Force • Where is the strongest part of a magnetic field / the weakest • A magnet always points which direction • What is the magnetic rock called?

  27. Electromagnet lab

  28. How can you increase the strength of an electromagnet’s field? • Wire • Battery (ferromagnetic material) • Solenoid • Loops • Loose loops vs tight loops • USING A STRONGER FERROMAGNETIC (BATTERY) MATERIAL FOR THE CORE

  29. ELECTROMAGNET • A STRONG MAGNET THAT CAN BE TURNED ON AND OFF

  30. INCREASING THE NUMBER OF LOOPS IN A SOLENOID WILL CAUSE THE STRENGTH OF ITS MAGNETIC FILED TO ______________?

  31. Hans Christian Oersted

  32. A COMPASS MIGHT NOT POINT NORTH IF PLACED NEAR A WIRE WITH A CURRENT, WHY? • THE CURRECT (MAGNET) CREATES ANOTHER MAGNETIC FIELD ASIDE FROM THE EARTH’S NATURAL MAGNETIC FIELD AND CHANGES THE DIRECTION

  33. https://www.youtube.com/watch?v=3KkOqVEa1oI • AN ELECTRIC CURRENT PRODUCES A MAGNETIC FIELD.

  34. https://www.youtube.com/watch?v=6tG9fY0WX3U

  35. Research Galvanometer

  36. Galvanometer • an instrument for detecting and measuring small electric currents. • an instrument for detecting and measuring small electric currents.

  37. https://www.youtube.com/watch?v=v7uvdFRt3Sc

  38. Electric motor- transforms electrical energy into mechanical energy Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. In other words, it is energy in an object due to its motion or position, or both. Electrical energy is a form of energy resulting from the flow of electric charge. 

  39. Do car motors have magnets? • Almost anything that uses a motor or electricity to operate is built with magnets

  40. https://www.youtube.com/watch?v=-mFHTRqbSuQ https://www.youtube.com/watch?v=wxG3cwugXgs https://www.youtube.com/watch?v=s3VZNae9jJo

  41. Magnet fact Magnets are attracted to IRON.

  42. How can iron fillings be used to map out the magnetic field of an magnet? https://www.youtube.com/watch?v=j8XNHlV6Qxg