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• Publicado : 11 de octubre de 2010

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1.- Describe what work means and the units for it in the international system and the British system.
It is the amount of energy transferred by a force actingthrough a distance. Its units are the Joules for the International system and the foot-pound for the British system.

2.- Is work scalar or a vector? Explainwhy.
Work is scalar because it doesn’t consider changes on the coordinate system.

3.- Define the concepts of mechanical, potential and kinetic energy.Mechanical energy describes the sum of potential and kinetic energy present in the components of a mechanical system. It is the energy associated with the position ofn object.
Potential energy is the one stored in a body due to its position in a force field or due to its configuration.
Kinetic energy is the one which ispossessed by an object due to its motion. It is the work needed to accelerate a body of given mass from rest to its current velocity.

4.- What is therelationship between them?
Potential is the one that an object has that is keeping it at rest, kinetic is the one necessary to move that object and the mechanical is thesum of both.

5.- Explain the law of conservation of energy.
It states that the total amount of energy in an isolated system remains constant over time. Aconsequence of this law is that energy can neither be created nor destroyed, it can only be transformed from one state to another.

6.- What is power? What are theunits to measure power?
The rate at which work is performed or energy is converted. It is measured in Watts that is equivalent to one Joule per second.