Computer Interface Cobra4

Coupled pendula on the magnetic board

Principle

Oscillations occur in physics in an extremely wide range of occurrences.They are macroscopically visible in the swinging and cushioning of cars or suspension bridges. In Nature, however, there is as a rule never a single oscillation but always only co ...

Weight

Principle

"A mass is not only inert but also heavy." Which is intended to mean that not only is a force necessary to accelerate a mass, but also that each mass in the earth's gravitional field experiences a force, the force of weight. The force of weight is to ...

Bending of a leaf spring

Principle

Leaf springs are thin metal plates that are elastically deformed under load: When a force is applied to a
leaf spring, then it is subject to deformation. A characteristic of such an elastic deformation is that the
original shape is re-for ...

Helical spring pendulum

Principle

In this experiment observations are to be made on a spring pendulum which consists of a helical spring
with a spring constant D and a mass m which is hung on it. When the pendulum is displaced by smax and
let go of, it swings across its r ...

Thermal equilibrium

Principle

Why do tea or coffee get cold onstanding, but never hot?

Tasks

Watch the water temperatures when a vessel containing cold water is dipped into a hot water bath.

Thermal insulation

Principle

A quick loss of heat is sometimes not wanted. What can be done to keep the temperature in a vessel
constant?

Tasks

Measure the cooling of hot water in two different environments:

• In a glass b ...

Heating of water

Principle

How depends the time required to heat up water on the amount of water when a defined heating source is available?

Tasks

Heat up various amounts of water with an electric heating coil and measure the time dependence ...

Heating of various liquids

Principle

Do different liquids heat up to the same extent when subject to the same heating?

Tasks

Heat 100 g and 100 ml of water and of glycerol with an electric heating coil and measure the temperature
in dependence o ...

Specific heat capacity of water

Principle

In households, a great amount of energy is used to heat up water - for showers, for washing clothes, for cooking. Exactly how much is necessary for each degree that each mililitre of water is warmed up? How are amount of heat, heat capacity and change ...

Temperature of mixtures and heat capacity of the calorimeter

Principle

Quantities of heat distribute themselves so that finally all parts that are in contact with each other have the same temperature. If the heat capacities and the initial temperatures are known, then the final temperature can be predicted. Or, in rever ...

Specific heat capacity of metals

Principle

The calorimeter can be used to determinethe heat content of a piece of metal.The heat content can be calculated fromthe mixing temperature that is reachedin the calorimeter.

Tasks

Heat up metal bodies of the same ma ...

Calorimetric temperature measurement

Principle

Calorimetry can also be used to determine the temperature of a hot object that is difficult to measured by any other method, e.g. because it is too hot for the thermometers available. The heatcontent of the object can be calculated from the mixture t ...

Conversion of mechanical energy into internal energy

Principle

Different forms of energy can be converted into each other. Here the potential energy of steel pellets is converted to heat when falling pellets collide.

Tasks

Let the pellets dro ...

Evaporation

Principle

Drinks can be cooled by putting the bottle in a moist sock and letting the sock dry. The same process occurs when our bodies are cooled by sweating. The change in temperature that occurs is to be examined in this experiment.

Tasks

Definition of the magnetic flux density with Cobra4

Principle

Magnetism is a phenomenon that can be attributed to electromagnetic interaction. It manifests itself through the force that acts on magnetisable material and moving electric charges. The force is hereby conveyed via a magnetic field. Measurement is ma ...