Task 1


Materials and tools for a working group:

paper confetti (pieces of aluminum foil, pieces of plastic bag), paper clips, balloon, salt, thin stream of water (can use washbasin in class))

The teacher can follow up on the previous two topics and discuss with the pupils when it is possible to observe the effects of the forces at a distance. It encourages pupils to discuss magnets and gravitational effects on objects and asks whether they know other situations where it is possible to observe the attraction or repulsion of objects over a certain distance. If the pupils mention the electrification of the objects, then the teacher will follow it, if not, the teacher will show the pupils how to use the inflated balloon to attract electrified hair. In order to try this phenomenon, the teacher leads them to the solution of task 1, in which they are asked to find out which small objects can be attracted by the electronized balloon. First, the students create the preconditions for the teacher to determine how pupils have an idea of how the electrified object (a balloon that rubs against the carpet) works on various small items. Then the teacher asks the pupils how to find out whether their predictions are in line with reality or not. Discusses the exact process of verifying predictions. It is important to realize that the balloon must always be equally electrified, so it is important to always rub it on the same surface and always the same length. To be precise, we use a new balloon for each additional observation.

Pupils verify their predictions in an agreed way and make a conclusion from the observation. Their job is to write what they found out in their own words. When making a conclusion, the teacher directs them to notice the properties of the objects being attracted and the properties of the objects that are not attracted. In addition to paper confetti, they can also use pieces of plastic bag and pieces of aluminum foil to see how other materials react to electrified balloon.