Task 10

Materials and tools for a working group:

spirit level, marble

In this task, the teacher shows the pupils a spirit level. First, he discusses with pupils whether they know such a device and, if so, what it is used for. If they do not know the spirit level, they will explain to them that it is used to determine if the objects are placed horizontally. He will ask the pupils to look at it properly and try to explain what principle it works for.

Subsequently, the teacher leads the pupils to try to create a presumption of which of the classroom places (listed in the table) are stored horizontally and which are not. Use the spirit level to verify and record your predictions in a spreadsheet. Their next task is to explain how the use of the spirit level is related to the Earth‘s gravitational effect.

After the discussion, the teacher asks the children to take the ball and find the three places where the ball rolled and the three places where it would lie where they lay. They draw these places in a worksheet to discuss them. The aim of the discussion is to compare the places where the ball rolled with those where it stood and to find out what the difference between the two places is. The aim is to get the ball to go where the surface we put it on is not horizontal (straight).