4M Эко энергия (00-03287) [2/6] Trick 3 cd racer
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4M Эко энергия (00-03287) [2/6] Trick 3 cd racer

4M Эко энергия (00-03287) [2/6] Trick 3 cd racer
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TRICK 3 : CD RACER
From the kit: 1 tube end with centre hook, 1 plain tube end, 2 rubber bands, double-sided
adhesive tape
Recycle: 2 CDs, 1 toilet-roll tube
From home: 1 pencil
YOU’LL NEED
Assembly
1. Put some double-sided adhesive tape on either side of
the hole on both CDs. Peel off the backing paper. Press
the CDs onto the tube ends so that the double-sided tape
keeps them in place.
2. Find the tube with the hook at the centre. Hook 2 rubber
bands onto the hook. Insert it to the cardboard tube.
3. Feed the band through the cardboard tube and then
through the plain tube end. Make sure the tube ends fit
neatly onto the tube. Push a pencil through the loop in the
rubber band. One end should protrude about 5 cm outside
the edge of the CD.
Operation
Hold the cardboard tube and wind the pencil round and
round until the elastic band is tight. Place the CD Racer on
the floor and let go.
How it works
The wound-up rubber band tries to make the tube and the
pencil spin in opposite directions. The pencil can’t spin as
it presses on the ground, so the tube spins, which makes
CD Racer move along. The wound-up band stores energy,
and this energy is converted to movement energy in the
CD Racer.
Trouble shooting:
If the plastic tube ends are not securely fixed to the paper
tube, this will affect the performance of the racer. You may
apply some double adhesive to fix them in place
Fun facts
• Wind-up models such as planes and cars use wound-up
elastic bands to provide energy to move their parts. Winding
the band stretches it to several times its own length.
• A catapult uses the energy stretched elastic to re a
object.
• Most old clocks are powered by a coiled metal spring.
As the spring unwinds, it moves the cogs that move the
clock’s hands.
Assembly
1. Using a sharp pencil, pierce a small hole in the base of
each paper cup. Ask an adult to help you with this.
2. Feed the ends of the elastic string up through the holes
in the bases of the cups, pull some string through and then
tie a few knots in each end. The knots will stop the string
slipping back through the holes.
Operation
You need two people to work the Walkie Talkie. Each person
holds a cup. Walk apart until the elastic silver string is
stretched but not too tight. One person talks into a cup
while the other listens (when you finish what you want to
say, say ‘over’ to tell the other person it’s his or her turn to
speak). Or gently touch the elastic string, you should be
able to hear some special space sound effects when the
elastic vibrates.
How it works
Sound is made up of vibrations. When you speak, you
make the air around you vibrate, and the vibrations spread
through the air. Your ears detect the vibrations so that you
can hear the sounds. When you speak into the Walkie Talkie
cup, the vibrations in the air make the base of the cup
vibrate up and down. The vibrations pass along the string
and make the base of the other cup vibrate too. This make
the air in the other cup vibrate, and the other person hears
the sound.
Fun facts
•Sound travels very fast. In the air it travels at about 1,200
km/h (that’s a kilometer in just three seconds).
• Sound travels much faster in liquids and solids than
it does in air. In water, sound travels at more than 5,000
km/h. In metals it travels at about 6,000 km/h.
• The Walkie Talkie only works if the string does not touch
anything between the cups. If it does, the vibrations can’t
pass by.
TRICK 4 : SPACE SOUND WALKIE TALKIE
YOU’LL NEED
From the kit: 1 elastic silver string
Recycle: 2 paper cups
Double-sided
adhesive tape
Elastic String
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