Electricity and Magnetism Journal

50 points

Name:____________________________        Date:____________        Period:______

You will maintain a journal of your observations and conclusions concerning a number of demonstration in class.  Some demonstrations are done for the class, while others you must obtain the items during various free times in class.  Attach all journal entries to this sheet, or present this sheet with your notebook to be graded.

Each journal entry must follow this format:

1.    Name,  number and date of demonstration

2.    Part 1:    A description of your observation of the demonstration.  In other words, what happened.

3.    Part 2:    An explanation of why it happened.

4.    Part 3:    What you learned.

5.    Pictures can be used to help describe any of the above.

Each Entry is worth 10 points.  A sample is at the bottom of this sheet.  Pick 5 topics from the list below.

1.    Magnetic Fields:  Green Sheet, Iron Filings & Ferromagnetism Liquid.  Explain how each of these items let you see the magnetic fields

2.    Magnet Levitation:  Explain the levitation of the two ring magnets, and the diamagnetic levitation

3.    Static Electricity:  Explain what happens and why when you rub the rods with the various cloths.  

4.    Static Electricity:  Explain the gold leaf static indicator.

5.    Van De gaff generator:  Explain how this works (the stuff inside).  Describe how the ball moves around it.

6.    Examine a circuit breaker and a fuse.  Explain the differences between the two.

7.    Voltmeter:  Test a battery.  Explain why the needle moves.  Reverse the leads and retest the battery.  Explain what happens

8.    Motor & Generator.  Explain how they are the same, and how they are different.  Consider design and uses.

9.    Copper Tube and metal pellets.  Explain what happens

10.  Battery-less Flashlight.  How does it work.

1.    Tuning Fork Resonance        5/20/2003 

    Two tuning forks were placed in two hollow wood blocks.  Each block had a hole in the end.  One tuning fork had a little weight attached to one of the prongs.  When one fork was struck, and placed near the other one, the one that was not struck started to vibrate all on its own.  When the weight was moved on the fork, we noticed that the tone created was different, and the forks would not make each other vibrate.

    An object tends to vibrate at its natural frequency, if that same frequency of vibration occurs nearby.  Moving around a weight on one prong of a tuning fork will change the tone it generates.

    I learned about resonance, which is the tendency of an object to vibrate at the same frequency as a sound source.  I also learned that adding weight to the prongs of a tuning fork will change its frequency.  This was the same thing as the video of the bridge falling down.