SUBSCRIBE MY LINKS:    chat center Chatboards Lessons Projects Classifieds Mailrings Jobs Harry Wong Live! Gazette Advertise CHATBOARD MAILRING LESSONS SEARCH LESSONS BROWSE SUBMIT LESSON Share | Print Teachers.Net Lesson Bank #224. Surface tension on coins Science, level: Middle Posted by Craig Hunter (huntcd@infinitytx.net). Lesson Plans for Middle School Science West Texas Middle School, Stinnett, Texas Materials Required: Coins, dropper bottles, soapy water and water Activity Time: 35 minutes or more if a graph is involved Concepts Taught: Surface Tension Surface tension on coins The purpose of this activity is to study surface tension, and the effect that soap has on surface tension....well actually to attempt to get teenagers to develop a few reasoning powers in their harmone-crazed brains. Materials needed: Coins: pennies, nickels, dimes, quarters (acutally I also use half dollars, and small and large silver dollars....left over from the tooth fairy years ago) Eye droppers (one per group) Water in a bottle (one per group) Soapy water in a bottle (one per group) Paper towels for clean up Step 1. The students should clean the coins in plain tap water to make sure that there isn't any soap left on them from the last class. If you're not sure that the previous class cleaned the eyedroppers with fresh water, they should clean the droppers also. Step 2. The students should get their bag of coins (whatever coins you've decided to let them use). They should then place a coin on a paper towel and begin dropping water on the coin until the water overflows. They should record how many drops the coin held before the water overflowed. This number should be placed under a heading called "Plain Water." This procedure should be repeated with the remainder of the coins. Step 3. The students should then find out how many drops of soapy water each coin will hold before the water overflows. Step 4. The students can then make a color coded, double bar graph which indicates how many drops of water each coin held. Step 5. The students should then draw conclusions according to their data. Step 6. The students should then clean the coins and the eyedroppers with fresh water for the next class. Submit Lesson   Search   Browse   Request Lesson

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