Getting a Charge - Electrostatic Lab
If you missed today in 2013-21014
1. We had a shortened period because of the pep rally (dodge ball tournament) at the end of the day and band had to leave early 8th period also.
2. Period 2 the students made a Motor in the "It Can't Work" Lab. We will leave a setup in the back resource center so you can bring a classmate that did it up with you to make it up ASAP. Also, March 6th (a Thursday) Room 2340 will be doing the same lab if you wish to do it that day with them.
Periods in room 2340 did the electrostatic lab. Again, we will place a setup in the back resource center to get it made up or you can take it with classroom 2342 this week Thursday all day (periods 1,2,3,7,and 8).
Just a video of Mr. Konichek explaining a normal early morning setting up for Physics classes:
Below is a video of Mrs. Donahue's 1st Period class working on the electrostatic lab today:
If you missed today: Below is 2012-2013 information
1. I first had to apologize to Mrs. Pliska, Mr. Slesak, and Mr. Flasch that yesterday I had number 3 wrong on the back of our worksheet. When you charge by INDUCTION the electroscope is ALWAYS OPPOSITE the CHARGE OF THE ROD. So number 3 on back of the Electrostatic Study Sheet should be c NOT b.
period 1 period 4 period 5 period 7 period 8
period 1 period 4 period 5 period 7 period 8
2. The Getting a Charge - Electrostatic Lab is a 15 point quickie lab done with a partner and a setup is in the back of Mr. Jenkins room if you bring someone who done it (to help you make it up).
In class, each group of two (same partner as last lab) first checked to make sure they had a (they removed most of them from the box as they checked) rabbit fur, silk piece, rubber rod, glass rod, tub of plastic packing peanuts, a small box with a neon bulb and a comb in it, a pith ball electroscope, and a thin plastic straight edge.
Next each group had one partner carefully take a gold leaf electroscope of the cart in front of the classroom. Important: the gold leaf electroscope breaks very easily with two much charge near it so the blown up balloons and the pvc pipes where hidden during this time.
First we rubbed the glass rods with the silk and brought near the gold leaf electroscope (gle) and watched the behavior. Then using the glass rod we tried to charge by conduction (and noticed we couldn't because the electrons refused to go onto the glass rod) and then we used the glass rod to charge by induction (no problem as the electrons were coming through our body from Earth (ground)).
Next we carefully rubbed the rubber rod just once with the fur (so not to overcharge it) and repeated the above polarizing the gle by induction, and charged by induction and conduction.
NOW WE PUT THE GOLD LEAF ELECTROSCOPES BACK ON THE CART AND REMOVED THEM FROM THE CLASSROOM. So now each group could get a pvc pipe and a balloon from up front and the lights were turned off so they could charge their pvc pipe and notice the neon light would light up by the negatively charged pvc pipe without touching it (as the air molecules acted as a bridge to carry the charge to the neon gas exciting the electrons to a higher orbit around the nucleus of their atom and when the electron dropped back the visible light occured).
Then we noticed that the positive rabbit fur did not have the same effect so the neon light is a way to see if an object has a negative or positive charge on it.
Next we had five groups take their rabbit fur and rubber rod over the static generators with tinsel hanging off the metal can and charge the tinsel by turning doing work on turning the crank. Once the tinsel was charged they charged the rubber rod and checked to see if the tinsel had a positive or negative charge on it.
Finally the students were given time to finish the lab. Materials were all returned as they found them.
Next each group had one partner carefully take a gold leaf electroscope of the cart in front of the classroom. Important: the gold leaf electroscope breaks very easily with two much charge near it so the blown up balloons and the pvc pipes where hidden during this time.
First we rubbed the glass rods with the silk and brought near the gold leaf electroscope (gle) and watched the behavior. Then using the glass rod we tried to charge by conduction (and noticed we couldn't because the electrons refused to go onto the glass rod) and then we used the glass rod to charge by induction (no problem as the electrons were coming through our body from Earth (ground)).
Next we carefully rubbed the rubber rod just once with the fur (so not to overcharge it) and repeated the above polarizing the gle by induction, and charged by induction and conduction.
NOW WE PUT THE GOLD LEAF ELECTROSCOPES BACK ON THE CART AND REMOVED THEM FROM THE CLASSROOM. So now each group could get a pvc pipe and a balloon from up front and the lights were turned off so they could charge their pvc pipe and notice the neon light would light up by the negatively charged pvc pipe without touching it (as the air molecules acted as a bridge to carry the charge to the neon gas exciting the electrons to a higher orbit around the nucleus of their atom and when the electron dropped back the visible light occured).
Then we noticed that the positive rabbit fur did not have the same effect so the neon light is a way to see if an object has a negative or positive charge on it.
Next we had five groups take their rabbit fur and rubber rod over the static generators with tinsel hanging off the metal can and charge the tinsel by turning doing work on turning the crank. Once the tinsel was charged they charged the rubber rod and checked to see if the tinsel had a positive or negative charge on it.
Finally the students were given time to finish the lab. Materials were all returned as they found them.