SCIENCE FROM JUNK

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MAKE A ROCKET CAR

You will learn to construct a car to demonstrate how rockets move by means of action and reaction. Your small car will be propelled by the action/reaction force generated by a balloon.

MATERIALS/TOOLS:

4 pins
Styrofoam tray
Cellophane tape
Flexi-straw
Scissors
Drawing Compass
Marker pen
Small party balloon
Ruler
Sandpaper

PROCEDURE:




1. Using the ruler, marker, and drawing compass, draw a rectangle 3 by 7 inches and four circles 3 inches in diameter on the flat surface of the Styrofoam tray. Cut out each piece. Use a sandpaper to make the wheels as round as possible.
2. Push one pin into the center of each circle and then into the edge of the rectangle as shown in the picture. The pins become axles for the wheels. Do not push the pins in snugly because the wheels have to rotate freely. Test them to be sure they rotate freely. It is okay if the wheels wobble.
3. Inflate the balloon a few times to stretch it out a bit. Slip the nozzle over the end of the flexi-straw nearest the bend. Secure the nozzle to the straw with tape and seal it tight so that the balloon can be inflated by blowing through the straw.
4. Tape the straw to the car as shown in the picture.
5. Inflate the balloon and pinch the straw to hold in the air. Set the car on a smooth surface and release the straw. 

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