The main objective of this OER is to understand the importance of making our daily lives more sustainable and planet-friendly, through practical work and research into the sources offered. The learning situation is set out in the form of tasks in which the student: ● Learn the contents of energy, different energy sources, renewable and nonrenewable energy sources and the Sustainable Development Goals. ● Research using the digital resources provided.

The forces of friction, which oppose displacement, also carry out work when a body is moving. The work of friction is converted into heat. The greater the force of friction, the more force must be exerted to move the body. Verify how friction affects the displacement of some blocks.

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

The educational resource shows an interactive animation about the latent heat concept: the energy needed to produce a change of phase per unit mass is known as latent heat.

Efficiency is a concept associated with work done by machines.In Physics this concept is defined as the quotient between the useful work done by the machine in a given interval of time and the total work invested in the machine during the same amount of time. The following visual summarises what efficiency is.

The area of the graph between the curve F and the X axis, represents the work carried out by the force between the two positions x0 and x. Review how to use the following visual and carry out the two proposed activities for a better understanding.

Forces can carry out work. The work done by a force is different if it has the same direction and orientation as the displacement, or if its direction is different.

Teaching unit work and energy for 4 º ESO. Work (W). Energy. Work and energy. Power (P) of a force / machine.