1. Dropping Magnets 1.What will you observe when I drop this magnet onto this piece of copper? Incorporate all of your senses.

2. Dropping Magnets Take 3 minutes and write down an explanation for your observations. Now work with your group members to develop an explanation that you are all happy with.

3. Eddy Currents The dropping magnet causes a change in flux in the block of metal. What does a change in flux cause? EMF This emf causes currents to flow in the piece of metal which produces a field to oppose the change in flux.

4. Visual of Eddy Currents

5. Eddy Currents Pendulum What will happen when the pendulum moves through a magnetic field? http://www.kineticbooks.com/physics/1 7218/17247/sp.htmlhttp://www.kineticbooks.com/physics/1 7218/17247/sp.html

6. Applications of Eddy Currents Can you think of any applications of eddy currents?

7. Braking Systems http://www.cars.com/carsapp/national/?srv =parser&act=display&tf=/features/intercar/i c_index.tmpl Uses friction to slow things down In the process material is worn away. Eddy current disk demonstration.

8. Drawbacks of Eddy Currents Can you think of any drawbacks? Eddy currents consume energy!!! See transformer demonstration How do you solve this problem? http://www.kineticbooks.com/physics/17218/ 17247/sp.html http://www.kineticbooks.com/physics/17218/ 17247/sp.html

9. Advanced Applications Use the measurement of eddy currents to find microscopic cracks in airplanes.

10. Eddy Currents Questions???