6.50

Coming In Activity

7:00

Opening Parade ()

Grey six on duty – Flag

- Escorts

- DIBS

- Prayer

7.15

Game – Milk Bottle Soccer

Bases

Base 1 – Rocket Launchers (in park)

Film canisters , Baking soda (sodium bicarbonate), Vinegar (acetic acid)

1. Take the top off the film canister and pack the lid tightly with baking soda.
2. Pour about two teaspoons of vinegar into the film canister.
3. Gently put the lid on the film canister and snap closed.
4. Turn the canister upside-down, put it on the ground, and stand back.
5. After a few seconds, the canister will shoot up into the air. If your rocket always fizzles, try a film canister with a tighter-fitting lid.

You are creating a chemical reaction between the baking soda (NaHCO₃) and the vinegar (CH₃COOH). The vinegar reacts with the baking soda, producing carbon dioxide gas (CO₂). Pressure builds up until the small canister can no longer contain the gas. The lid pops off, the canister shoots up into the air, the gas escapes, and the pressure is released.

Base 2 – Balloon Kebab

How to do it:

Blow up the balloons (not full) and tie them off. Line up the skewer point with the dark

The science bit:

This trick works because of surface tension. A balloon is formed by inserting air into a flexible thin rubber sheet (the balloon). Most of the balloon is stretched evenly. But there are two points where the rubber is least stretched - and thus there is lower surface tension. These areas are at the top of the balloon and near the tie at the bottom - the darker areas. Now get someone else who doesn't know the science to have a go! I bet they pop the balloon!

et patch at the top of the balloon. Gently push the skewer through - then push it out the the darker area round the tie. Voila! balloon kebab!

Base 3 – Balloon Blast Off

Here's what to do:

1. Tie one end of the string to a chair, door knob, or other support.

2. Put the other end of the string through the straw.

3. Pull the string tight and tie it to another support in the room.

4. Blow up the balloon (but don't tie it) Pinch the end of the balloon and tape it to the straw. You're ready for launch.

5. Let go and watch the rocket fly! You can experiment to figure out how to make the rocket go farther and faster.

1. Base 4 – Musical Straws

2. Flatten the last inch of the straw with your teeth, making sure that you don't curl the end. Flatter is better, so really press down hard. Cut the corners off the straight, flattened end of the straw. Check out the drawing.

3. Now you're ready to make music (and annoy everyone)! Place the cut end of the straw into your mouth, seal your lips around it, and blow until a "sound" is produced. You'll feel the entire straw vibrate as the sound is made. Don't give up if you don't make music right away; you may need to re-position the straw and try it again. You've just made a "double reed" mouthpiece, similar to an oboe.

4. Cut small sections off the bottom of the straw while you're making the sound. Listen for changes in the pitch as you cut the straw shorter and shorter. Watch out for your lips!

How it works:
When adjusted properly, the flattened ends of the straw will vibrate as air flows over them. The vibration is passed on to the column of air inside the straw. This is just like the double reed on some woodwind instruments. The vibrating reed produces the oboe-like sound in the straw based on the length of the straw. By cutting off pieces of the straw, you alter the length of the air column and thus change the pitch. The English horn, oboe, and bassoon all use this same principle of vibration to make sound. These instruments, however, change the length of the column of air with holes, stops, and pads. Scissors are impractical.

Here's a variation: Find two straws, one smaller than the other (the smaller should fit snugly inside the larger straw). Using the smaller straw, repeat Step 1 above. Slide the bigger straw up over the smaller straw and start blowing. Move the larger straw back and forth to change the pitch of the sound. It's a straw trombone (although any brass player worth his or her salt will tell you it's a lame attempt). Brass rules!

Base 5 – A well-balanced cork

1. Push the end of the toothpick into one end of the cork. Be sure to position it in the very center of the circle, but you don't have to push it in too far.
2. Carefully push one fork into the side of the cork towards the bottom. Be careful not to poke yourself (it's a great job for that adult helper who is begging to help out).
3. Push the second fork into the opposite side of the cork directly across from the first cork. Try to make the cork-fork contraption as symmetrical as possible.
4. Try to balance the end of the toothpick on the tip of your index finger or in the top of a bottle. Don't be surprised if your science art balances in an unusual position. Remember, you're trying to find the center of gravity just below the balancing point.
5. The toothpick does not have to be positioned in the bottom of the cork. Try pushing the toothpick into the side of the cork at the bottom to see discover a new center of gravity.

How it works:
The secret to this science stunt lies in your understanding of the concepts of center of gravity and stability. The center of gravity of any object is the point about which you can balance the object as if all the masses were concentrated or gathered at this point. In other words, it's the point at which the object balances from left to right, front and back and top and bottom. In your balancing fork act, the center of gravity is directly below the spot where the toothpick rests on the rim of the glass. If you look closely at your balancing fork-art, you'll notice that the fork handles are positioned below the toothpick. This actually puts the center of gravity directly below the point where the toothpick is balanced (called the pivot point). Here's where it gets really strange... the center of gravity where the forks balance front and back, left and right, top and bottom is actually hanging in mid-air.

Did you know... A circus tightrope walker often uses a long stick for balancing in the same way as the forks are used in this experiment. The real secret is not to give up or get frustrated if the forks fall. Just rebuild it and try again. Once you've mastered the balancing act, you'll be the hit of any dinner party.

Spare Time – Mobius Strip

1. Take a strip of paper.

2. Give it a half twist (turn one end over).

3. Tape the ends together.

What to do with a Mobius strip.

After you make your mobius strip, take a pencil and draw a line along the length. How many sides does the mobius strip have?

Take a pair of scissors and cut the moebius strip along the line you have drawn. What happened?

What do you think will happen if you cut it down the middle again? Try it.

If Cubs are finished other activity quickly

Yarn – Moving a hair through telepathy

Lay a hair on the top of a large tray/bucket of water. Explain how we have been learning about discovery and that it is possible to make the hair sink to the bottom if everyone channels their thoughts simultaneously. Continue to talk and encourage the kids to stare and think about making the hair sink. When everyone is concentrating the leader brings their hand down hard on the hair (and if done well gives the Cubs a good soaking).

8:20

Closing Parade

All

Cub Scout

Badge Award and Level

Notes and Reminders

Equipment

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