Magnetism

Engage Activity Get a BAR MAGNET and lay it down in the middle of your notebook. TRACE around the Bar Magnet to draw its outline in your notebook. Pick up the magnet and write the North pole and South pole on your drawing. Put the magnet back on top of the notebook drawing Using a compass, place the compass in multiple places around the magnet in your notebook and draw a tiny arrow that shows the direction the compass is pointing. You must cover (completely saturate) your notebook page with tiny arrows to see the results. TABLE TALK: Discuss with your table partner what you are seeing on this page in your notebook and what you believe is causing this phenomenon.

Why do Magnets Stick Together? Magnets have a magnetic field that surrounds them. This field is what causes the attraction and repulsion forces that we can feel when we play with magnets. The field is strongest around the ends which are called poles. Each magnet has one north pole and one south pole. Like poles repel, and opposite poles attract.

Electricity to Magnetism Moving electricity creates magnetic forces. These are called electromagnets which can actually be turned on and off. Moving magnetic fields create electric forces. This is how generators work.

Types of Magnets Temporary Magnets Permanent Magnets A magnet that keeps its magnetic properties for a short time Examples: Electromagnet Metallic Materials Permanent Magnets A magnet that keeps its magnetic properties for a long time Examples: Lodestone Bar Magnet Earth

Magnets have BOTH a N and a S pole, no matter how many times you “chop it up.” In your notebook, Draw the picture of what happens before and after you chop a magnet in half.

In your notebook, DRAW the EARTH and its field! The Earth is a magnet! Magnetic lines of force around the earth are like the field lines around a giant bar magnet. In your notebook, DRAW the EARTH and its field!

WATER IS POLAR LIKE A MAGNET! WATER is a MAGNET! The water molecule behaves like a magnet because of the distribution of charged particles in the molecule! WATER IS POLAR LIKE A MAGNET!

Neurons have 3 functions: 1. Reception, 2. Conduction, 3. Transmission The AXON of a Neuron in your brain behaves like a magnet to send electrical messages. 1. 3. 2. Figure 2.6 from: Kassin, S. (2001). Psychology, third edition. Upper Saddle River, NJ: Prentice Hall. Source: Neurons have 3 functions: 1. Reception, 2. Conduction, 3. Transmission Label the parts of the Neuron that are responsible for the three functions in your notes.

How ACTION POTENTIAL in a Neuron behaves like a magnet!

Magnetic Effects Aurora – Colorful light display caused by collisions between charged particles from the sun interacting with particles in Earth’s atmosphere. VIDEO 1 VIDEO 2

2 minute QUICK WRITE: What in today’s notes did you learn about magnetism that was NEW for you? Explain what was interesting about this new information and how you will remember it.