1st Short Description
Students should learn through contact with the spider crawling the effect of the gravitational force and the sliding and static friction.
2nd Factual information
See “friction” in the factual information for the teacher.
Operation of the crawling spider in friction experiments for kids:
When crawling spider touches the thread of the box in three places: at the point where the thread meets the transverse match and the two outer edges of the openings to which the thread goes into the matchbox inside. The stronger the yarn is stretched, the stronger the thread to the transversely installed will match and pushed to the edges. Thus the friction forces at the three sites will be substantially increased and the box does not slide down. If you reduce the tension, then the frictional force is smaller than the force of gravity and slipping down the box.
Thus, by changing the amount of friction depends on the spider thread or crawl down to him.
3rd Instructions for Teachers
-1 empty matchbox
-A thin thread (thread, length: 1 m)
-Colored construction paper or opaque colors for decorating
-1 tube of all-purpose glue (liquid)
-1 sharp pencil
First friction experiments for kids, a long piece of thread is cut and threaded into the eye of the needle. The thread is pulled through the needle through the middle of the short, the opposing sides of the inner box (see Figure 1). The firing head of the match is stopped and the match pieces clamped perpendicular to the filament inside the box, without deforming the box too much (possibly match the placard in the box).Must continue to be paid to the fact that the match is somewhat higher tha friction experiments for kidn the yarn is attached (see Figure 2).
Then the box cover is decorated by sticking a spider or caterpillar of the large area of the box.
Finally, the matchbox back together and can begin crawling (Fig. 3).
It’s easy to let the spider crawl down the thread.
Initially, the spider is at the upper end of the thread to crawl slowly downward.Now gently pull the thread tight so the spider does not slide down. Then the voltage is reduced friction experiments for kids slightly so that the spider slips slowly down. To see a spider crawling slowly, one needs a little practice.
4th Tips and Tricks
Instead of the spider legs from construction paper, one could also use pipe cleaners, which would make the spider look more natural.
For a striking magic trick the spider crawling should be practiced beforehand.It’s not so easy to let the spider crawl slowly and evenly!
The eyes of the spider can use the punch to be stamped out. Is possible to produce a lot of eyes without much effort.
You could also decorate the matchbox shape or color.
You can decorate and cut out the spider twice so that both the upper and lowerside of the matchbox with friction experiments for kids.
5th Alternative: the obedient bee
Instead of a “crawling spider” you could train a ”bee obedient”.
1 Children’s Surprise (You only need the yellow plastic egg.)
A thin thread (thread, length: 70 cm)
1 Stanley knife
A stable surface
A thick nail (length: about 4 cm, thickness: 3 mm min.)
1 combination pliers
See Figure 5 - 10
First, with a heated nail melted two holes in the egg - at the top and bottom of thepage. Then the cork is shortened (carpet knife + stable surface) so that it fitsacross the egg. After that, a thread pulled through the two holes and closed the egg (see Figure 5 in friction experiments for kids).
By varying the tension of the yarn and therefore the friction, the sliding velocity of the egg can be influenced. This requires that the thread can be clamped in a vertical direction.
The operating principle is the same as in the matchbox.