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### 20 Cards in this Set

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• Back
 What is energy? the ability to do work When work is done 2 important factors are present....what are they? 1)a force is exerted 2)the force cause something to move Work is therefore done where? ON the object that is moved The unit of energy is the _______ Joule (J) The main forms of energy are? mechanical, heat, light, electrical, chemical, nuclear and sound There are 2 types of mechanical energy...name them. 1)potential or stored energy 2)kinetic enery, possesed by moving bodies What is non-renewable energy? non-renewable energy is, sources of energy that exist only in a fixed amount Give 3 examples of non-renewable energy coal, oil and natural gas What is renewable energy? renewable energy is, sources of energy that will continue to exist as long as the sun does What is density? density is defined as the mass per unit of volume(how much of the substance is present in a given volume) As the mass increases and the volume remains the same then the density will _________ increase If the mass remains the same then the volume decreases the density _____________ deacrease Density = mass/volume What is the unit of density? kilogram per cubic metre For smaller volumes? gram per centimetre cubed What is pressure? the force that is applied over a given area. To determine pressure you must know the what? the force applied and the area over which it is applied pressure = force/area P = f/a What is the unit of pressure? newton metre square or pascal (Pa)