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.

Concept of indirect measurements

Didactic unit about waves and undulatory phenomena for 4 º compulsory secondary education course. What is a harmonic vibration? What is a wave? Superposition of waves. Phenomenon of diffraction. Other properties of waves.

Didactic unit about momentum for 4th of compulsory secondary education. Introduction. Momentum and Impulse. Collisions of particles. Disintegration of particles.

Introductory Kinematics teaching unit for 2nd year of Compulsory Secondary Education (ESO) (MEC). Different types of movement. Uniform motion. Accelerated motions. Representations of Movements.

Static teaching unit on the 4th year of compulsory secondary education. Magnitude Forces (or Length), Sense and Components of a Force direction. Effect of various forces. Resulting. Balancing force. Activities.