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Pinball Wizard


Make a pinball machine that can shoot a marble and send it zigzagging down an obstacle course.

  • Target Age: 6-10
  • Skills/Subjects: Science and engineering
  • Related Episode: Episode 502: Game Show Isle

WHAT TO DO

1. Get what you need:

  • shoe box top
  • clear tape
  • scissors
  • 2 cups from an egg carton
  • straws
  • brass fastener (1/2" or 3/4")
  • thin cardboard
  • marble
  • pencil
  • optional: small paper cups, bottle caps, pipe cleaners, markers, aluminum foil, odds & ends

Tilting the box2. Tilt the box.Tape two egg carton cups to the bottom of one end of the box. This creates an inclined plane (a slanted surface).

3. Design a lever.

  • Fold a 2-inch-long strip of cardboard in half lengthwise to make a lever.
  • Position it in the lower-left corner of the box, as shown, so that the lever can shoot the marble.
  • Attach it to the box with a brass fastener, poking a hole in both the lever and the box with a pencil.
  • Flick the lever with your finger to test if it can shoot the marble. If necessary, shorten your lever or reposition it until it works.

4. Make a path. As shown, tape down a straw to lead your marble to the top of the box.

5. Add a curve.In the top left hand corner, tape a piece of paper to create a curve so your marble rolls smoothly to the right. Test and redesign until it works.

Set up the box

6. Build an obstacle course.Lead your marble to the bottom of the box by taping pieces of straw at different angles (these are inclined planes). Work from the top to bottom, testing as you go.

7. Get creative. Add curves, arches, or tunnels using cups, paper, tin foil, and anything else you can think of!

CHEW ON THIS!

Your pinball machine was built using two kinds of simple machines: a lever and an inclined plane. The lever shot the marble to the top of the box with lots of force. The inclined planes made the marble wind its way down to the bottom.

Did you notice how much testing it took to get your pinball machine to work the way you wanted it to? Testing and experimenting are a big part of being a scientist and engineer—that's how brilliant solutions and great discoveries happen!

DIG DEEPER!

  • Take it outside. Make another pinball machine, this time using materials from nature to construct the obstacle course (rocks, twigs, leaves, seeds, etc.). Build a nature trail for your marble!
  • Magical marble tour. Send a marble on a long, crazy journey! Place some books under two legs of a table so that the surface is tilted. Your goal is to make a winding maze that leads the marble from the highest to the lowest point. Use books, bottles, cans, cardboard, paper towel tubes, straws, paper cups, and tape.

DID YOU KNOW?

Pinball machines are mechanical wonders that launch a steel ball on a wild ride around a colorful table full of flashing lights, bells, buzzers, and flippers. The golden age of the pinball machine was in the 1950s and 1960s. Kids used to play them in penny arcades and amusements parks. But once video games became popular, pinball machines became an endangered species. Today, only one company still makes them.

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