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