The educational resource shows an interactive animation about the thermal equilibrium: when two substances at different temperatures are in contact, they exchange a certain amount of energy. One's temperature increases, and the other's decreaeses. In the end, they both reach the same temperature, which is known as equilibrium temperature.

The educational resource shows information about the concept of thermal energy: thermal energy is due to the movement of the particles which make up matter.

The educational resource shows an interactive animation about the thermometer: the fact that mercury and alcohol expand when the temperature increases is used to construct thermometers.

The cathode ray tube gave rise to an application which had an application that became very popular in the second half of the twentieth century: television.

The educational resource shows a visual about the solar system: What is at the centre, the sun or the earth? This question has been asked since the beginnings of humanity. The answer is found in the different models of the solar system.

The educational resource shows a visual: it is a simulation of the solar system, you can select the planet you want to see and also vary the plane of the orbits.

The educational resource shows a visual about the solar system: the solar system is formed by the sun and all the astronomical bodies which orbit around it.

The educational resource shows a visual about the intensity of the electric field: a body's electric charge alters the space which surrounds it. The magnitude which measures this alteration at a determined point is the intensity of the electric field at this point. It is defined as the force exerted on the unit of positive charge situated at this point.

The educational resource shows a visual about the principle of superposition: when we talk about systems with more than two bodies, we have to bear in mind the Principle of superposition of forces: the force exerted by one body on another is independent of that exerted by the rest.

The educational resource shows a visual about the shape of galaxies: what causes the variety of shapes among galaxies? Some are spiral galaxies, others are elliptical or spherical.

The educational resource shows a visual about the planets: in addition to our planet, there are another eight planets travelling around the sun.

The educational resource shows an interactive animation about the mechanical equivalent of heat.

The inclined plane concept. With an inclined plane we can understand what forces are acting on the bodies resting on surfaces.

The educational resource shows an interactive animation about the heating curve: when a body is heated, its temperature increases until there is a change of state; while the change takes place, the temperature remains constant.

Relation between the power consumed and the supplied one for the generator.

The educational resource shows an interactive animation about the second law of thermodynamics for heat engines: it is not possible to achieve perpetual motion based on continuous reciprocal conversion between two forms of energy.

The educational resource shows an interactive animation about the first law of thermodynamics. The first law of thermodynamics establishes that energy is distributed in different ways, but it is not created or destroyed.

The educational resource shows how the energy is the capacity to produce changes in the environment by doing work or transferring heat. This means that when a body transfers heat or does work, its energy decreases.

The educational resource shows a visual that represents a capacitor, a system made up of two conducting plates with equal charges, but with opposite signs, separated by an insulator or a vacuum. Inside it the intensity of the field is approximately uniform, equal at all points.

In the following visual you can observe how the rotational axis of the earth is inclined; when the North Pole is furthest from the sun, the South Pole is nearest the sun and vice versa.