Physics
46500920 / 55500676
Fluids and Viscosity
Liquids and their Properties
Be it the honey on our breakfast toast, the water from the tap or the air surrounding us – they all have one thing in common: in a physical sense they are fluids. That means: if you expose these substances to shear forces, their molecules are shifted against each other and the substance deforms continuously. With honey the shearing force of the knife on the one hand, and the resistance of the rough surface of the bread on the other, lead to this deformation – the honey is easy to spread. Fluids react to even slight force application. The deformation rate increases proportionally to the amount of shear stress. Therefore water flows faster from a plastic bottle when it is compressed more strongly. Physically speaking: the stronger the force, the faster the fluid is deformed. A solid, in contrast, offers a greater resistance to shear forces. Tension is built up inside it until eventually, above a certain threshold, deformation occurs – the stick breaks. But a solid can become a fluid if it changes its state of aggregation and melts. So the ice cube is no fluid, its melt water, however, is. It is easily deformed. It is almost the same with solid and molten steel. Thus temperature plays an important role in the behaviour of fluids.
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Curriculum-centred and oriented towards educational standards
Matching
Rights and Obligations
Three girls of different ages: Anna is 17, Paula 15 and Lena 13. Before the law, their respective ages have consequences – because children and adolescents have different rights and also obligations.
Peer Mediation
Lena and Max attend the 7th form. Max is new in class. During a break, Max notices that Lena and her friend are laughing at him again. Max loses his temper! He slaps Lena in the face. That hurts and Lena runs back into the classroom with a red cheek. The growing conflict between the two has escalated. Just like Lena and Max, every day pupils all over Germany have rows with each other. At the Heinrich Hertz Gymnasium in Thuringia, pupils have been trained as mediators for years. At set hours, they are in a room made available by the school specifically for mediation purposes. The film describes the growing conflict between Max and Lena and shows a mediation using their example. In doing so, the terms “conflict” and “peer mediation” are explained in a non-technical way. The aims of peer mediation and its progress in five steps as well as the mediators’ tasks are illustrated. The art of asking questions and “mirroring”, which the mediators must know, is described and explained. Together with the comprehensive accompanying material, the DVD is a suitable medium to introduce peer mediation at your school, too.
Resuscitation
It can happen to anyone – of any age, in any place, at any time. Sudden cardiac arrest may quickly prove fatal. Immediate action is called for! Just remember: Check Call Press Anyone can do it. You can't do anything wrong!