Saturday, September 8, 2012
1 old CD
1 wooden spool
1 12” party balloon
4 pscs 10 cm x 2 cm piece of duct tape
Thin card (if needed)
1. Take 1 piece of tape and attach half of it lengthwise to the base of the spool.
2. Centre the spool over the hole of the CD and tape the spool to the CD.
3. Repeat Step 2 with each piece of tape making two strips parallel on opposite sides of the spool and the other 2 parallell at 90 degrees to the first pair so that the base of the spool in securely taped to the cd with no air leaks.
4. Inflate the balloon to stretch it somewhat. Let the air out. Attach it over the wooden spool.
1. Inflate the balloon by blowing through the base of the cd. Squeeze the base of the balloon to hold the air in while you inhale before blowing more air into the balloon.
2. Gently push it along a smooth surface.
How far did it go in cm (m)? (Intent: To demonstrate Newton’s 3rd Law of Action (air coming out of the balloon in a downward motion) and Reaction (the cd moving up in the opposite direction). Newton said that for every action there is an opposite and equal reaction. The distance the disc travels is related to thrust and friction.