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This video shows how the state of motion, gravity and magnetic attraction of objects changes when different physical forces act on them. The film shows that the effects of these forces are measured in Newtons and that they are vector quantities. The law of interaction is also explained with examples.
Welche Kräfte bewegen unsere Welt? Diese Frage beschäftigte schon die alten Griechen. Die Dokumentation zeigt, wie und durch wen sich die Wissenschaft der Physik entwickelt hat, und zeichnet die gravierenden Änderungen nach, die die Fortschritte in diesem Bereich auf die menschliche Sicht der Welt hatte.
The physical term work is defined as the force exerted on a body in a certain way. In physics, a distinction is made between the work of lifting, acceleration, deformation, tension and friction, as the video explains with the help of examples from everyday life. The unit used to measure work is the joule.
Archimedes originally set out the law of the lever. The film shows how it has been developed since then and how it leads directly to the law of rotation. The law is explained and its practical uses demonstrated, for instance the wheel and axle which is used in ship´s rudders and many times in bicycles.
Joao Magueijo schafft es, die Welt der theoretischen Physik auf den Kopf zu stellen: In seinem Fachgebiet Kosmologie beschäftigt sich der junge Portugiese mit Fragen rund ums Universum. In dieser Dokumentation erklärt er dem Zuschauer anhand alltäglicher Beispiele seine bahnbrechenden Theorien.
In den ersten acht Episoden der Reihe wurden die 100 größten Entdeckungen auf den Gebieten Biologie, Physik, Chemie, Medizin, Genetik, Geologie, Astronomie und Evolution vorgestellt. In dieser Folge waren allerdings die Zuschauer die Experten: Sie haben gewählt und ihre "Top Ten" bestimmt.
Am 26. April 1986 explodierte der vierte Reaktor des Atomkraftwerks in Tschernobyl und veränderte das weltweite Bewusstsein für die Risiken der Atomenergie. Dieses Medium verbindet Augenzeugenberichte, Erinnerungen von Michail Gorbatschow und Bilder des Fotografen Igor Kostin zu einem chronologischen Protokoll.
Electrical engineers often use transformers. They can easily turn a low primary voltage into an unequally higher or lower secondary voltage. How this works in detail, for what purposes one needs this transformation in everyday life and what electromagnetic induction is exactly, is explained in the film.
The topic of this video is the relationship between voltage and amperage. The film introduces the units of measurement volts for electrical voltage, watts for power, joules for energy, and amperes for amperage. It explains why the higher the voltage, the lower the amperage needed for certain outputs.
Lifting heavy loads using a rope running over a roller does not have to counteract the friction. This film explains how adding a second roller means that only half as much force has to be applied. Multiple rollers in the right sequence create a practical pulley. We look at the physical basics of these tools.
Es ist für Wissenschaftler nicht leicht zu beantworten, was Licht eigentlich ist. Das liegt unter anderem daran, dass es sowohl Welle als auch Teilchen ist. Licht könnte als extrem leistungsstarker Datenspeicher dienen, wenn es nicht zu schnell wäre. Forscher in Boston arbeiten daran, es zu verlangsamen.
Bei den alternativen Antrieben für Autos haben Batterien aktuell die Nase vorn: Tesla-CEO Elon Musk etwa glaubt nicht an Brennstoffzellen. Der Film erklärt die Nachteile der Zellen, zeigt aber auch auf, woran es bei den Batterien hapert und weshalb sich die Brennstoffzellen doch noch durchsetzen könnten.
The first semiconductors were discovered in passing when people wanted to make the light bulb more economical. Since then, a lot has changed about them. The film retraces this development and explains not only how the diode works, but also some important technical terms and the use of semiconductor diodes.
If forces act on a body at different points of application, their effect is different. The film shows which rules are used to determine the resultant of two individual components on the one hand, but also two individual forces from the resultant, a component, or an angle on the other by means of the parallelogram of forces.
The electrical resistance is defined as the quotient of the voltage and the strength of the current flowing in a circuit. At the same time, resistance also refers to a component with which a certain resistance can be realized in an electrical circuit. The film explains both terms using understandable examples.
Light travels at very high speed in a vacuum as well as in the air. As soon as it hits a denser material, however, its speed is slowed down. The film explains the refractive index, demonstrates why light rays are deflected in water, for example, and shows what angle is needed for a total reflection.
Levers are simple machines, or more precisely, they are mechanical force converters that magnify the force which is applied. The film explains the law of levers and shows the different forms of levers. Examples of different lever tools are given, such as scissors, tweezers, wheelbarrows, and nutcrackers.
Inertia is a physical property of all bodies. The video explains the law of inertia, according to which all bodies remain at rest or in uniform motion until an external action stops it. We encounter the law of inertia everywhere in everyday life, as the film illustrates with examples such as car and train travel.
The subject of this video is energy. There is the mechanical, the thermal and the electrical energy. Energy is not produced or consumed, but transformed. The film explains this using the law of conservation of energy. It is shown how one form of energy is converted into another, and the unit joule is explained.
A electromagnet is made up of a coil with an iron core around which a magnetic field is generated as soon as electricity flows. This film shows how electromagnets can be used, for example as relays for high voltage circuits, for doorbells, in magnetic resonance therapy, and in particle accelerators.
Electricity flowing through a wire generates a magnetic field. If this wire is twisted into a coil, the magnetic fields of the individual turns merge into a single stronger field. An iron core in the middle can intensify this effect. With this description, the video explains the construction of an electromagnet.
Viele kurze Filme und Animationen bringen den Schülern das wichtige Thema Energie näher: Es wird der Unterschied zwischen fossilen und regenerativen Energieträgern ebenso erklärt wie die Umwandlung von Energie in Strom. Ihre Nutzung, zukunftsweisende Projekte und aktuelle Informationen sind weitere Themen.
Mass is one of the seven basic physical quantities. This video gives an understandable definition of this quantity, names its unit of measurement and explains how it is related to the force of weight. Colloquially and outside the physical context, mass is also called weight, which can lead to confusion.
The moon does not shine itself, but only reflects the light of the sun. That is why the phases of the moon depend on it. The film shows how the moon changes in our perception depending on the angle it is at to the sun. At an angle of zero degrees it is new moon, at an angle of 180 degrees it is full moon.
Optical devices influence the course of light rays through lenses. The film shows how lenses are made in the eye and in visual aids such as glasses. The much stronger lenses of magnifying glasses and microscopes are also examined in detail. It is explained how exactly the multiple magnification is achieved.
Optical lenses are transparent, light-refracting bodies with at least one curved surface. The video introduces the different forms of lenses and how they work and shows their uses. Important terms such as focal point, refractive power and focal length are explained and the two lens formulas are derived.
Georg Simon Ohm discovered that voltage and current are interdependent. This video explains electrical resistance, Ohm´s law and the relationships that can be derived from it. The influence of length, strength, and temperature of a conductor as well as the calculation of electrical resistance are further topics.
We take it for granted in everyday life that electricity "flows". This video explains electrical circuits and the movement of electrical load carriers within them. It also looks at conductors and insulators, at the effect of negatively and positively charged materials on one another, and at induction.
Lorentz force describes the effect of magnetic fields on moving electrons. It acts perpendicularly to the magnet´s field lines and to the direction of the electrons. The film shows how to determine the direction of movement of the electrons using the three-finger rule and where this force is used for technical purposes.
Taking water as an example, the film explains the different states of aggregation of a substance. Below 0 °C, water is solid – it exists as ice. At its melting temperature of 0 °C it takes on liquid form, and at boiling temperature of 100 °C it changes to the gaseous state at normal pressure.