1, children's interesting DIY physics and science and technology small production - light bulb light up

Production principle: the current through the series circuit, the current has only one path, the current through a lamp must go through the other lamp, so the small lamp will be lighted up at the same time.

a. Prepare the materials.

b, stick double-sided tape on two small wooden sticks to the base. ?

c, Use screws to connect the bulbs in series.

d, Install the battery box and switch with screws.

e, Connect the wires on the battery box.

2. Tutorial for making a repeating leather band gun

a, the body of the gun is two pairs of disposable chopsticks, and the trigger and grip are separate and tied together with a leather band.

b, "barrel" at the opening is used to hook the bullet band.

c, Now we're going to load the first round, hooking the back end of the red leather strap to the receiver, and the front end naturally to the notch at the front of the barrel.

d, the key to see the second band on the way. The second band is not a "bullet", with a green-colored band to distinguish. Put the green leather band over the front of the receiver and stretch it back over the grip.

e. Wrap it around the vertical chopstick at the back end of the grip and hang it from the angled chopstick at the front end.

f, followed by the second round, which is the red leather strap.

g, then on the second green leather band, and keep repeating the installation of bullets. So on and so forth, to achieve the purpose of the leather bandolier gun continuous shooting.