Fourth year of secondary education
Work, power and energy
I. Sevila
 W.P.E. 
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WORK, POWER AND ENERGY
 

All of us use words like work, power and energy.  In this unit we will define their meaning in the context of physics; we will evaluate the need for such exactitude in order to tackle many facts of daily life; and investigate new applications; we will verify how the calculation of work (W), of the power (P) produced by a machine or the measurement of energy (E) consumed or stored, are very useful for maintaining and developing the society in which we live.

Let's have a look at the ideas we already have about work, power and energy.

The sun is an inexhaustible source of energy. Without it, life on earth could not exist.

The source of part of the electric energy we consume comes from the energy stored in the reservoirs

powerful hoist needs energy (fuel) to keep on working

Work (W)
What is work (W) in science?
Forces do work
The force of friction and work
Energy
Kinetic energy
Potential energy
The principle of the conservation of energy
Transformation of energy
Work and energy
The power (P) of a force/machine
EVALUATION