# work and energy

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• Created by: Georgina
• Created on: 20-02-14 21:17
one joule....
is the work done when a force of one newton moves its point of application one metre in the direction of the force
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Energy
is the stored ability to do work
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conservation of energy
in a closed system where energy may be maybe converted from one form to another, but cannot be created or destroyed
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Gravitational potential energy
is the energy stored in an object by virtue of its position in a gravitational field
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Kinetic energy
is the work an object can do by virtue of it's speed
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Power
is the rate of doing work
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one watt..
is equal to one joule per second
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stress
is force per unit cross-sectional area
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strain
is extension per unit length
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brittle
a material that distorts very little even when subject to a large stress and does not exhibit any plastic deformation e.g. concrete
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compressive force
two or more forces that have the effect of reducing the volume of the object on which they are acting or reducing the length of the spring
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ductile
materials that have a large plastic region(therefore can be drawn into a wire) for example copper
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efficiency
the ratio of useful output energy to total input energy
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elastic deformation
the object will return to its original shape when the deforming force is removed
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elastic limit
the point at which elastic deformation became plastic deformation
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elastic potential energy
the energy stored in a stretched or compressed object(for example a spring) measured in joules
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extension
the change in length of an object when subjected to tension
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Force constant (k)
the constant of proportionality in Hooke's Law, measured in Newtons per metre
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Hooke's Law
The extension of an elastic body ins proportional to the force that causes it
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plastic deformation
the object will not return to its original shape when the deforming force is removed, it becomes permanently distorted
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spring constant
force per unit extension
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Stopping Distance
the thinking distance and braking distance
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tensile force
usually two equal and opposite forces acting on a wire in order to stretch it, when both forces have the value T, the tensile force is also T not 2T
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tensile stress
the tensile force per unit cross-sectional area
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ultimate tensile strength
the maximum tensile force that can be applied to an object before it brakes
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ultimate tensile stress
the maximum stress that can be applied to an object before it brakes
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Young modulus
the ratio between stress and strain measured in pascals
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work
the product of force and the distance moved in the direction of the force, it can also be considered as the energy converted from one form into another, measured in joules, a scalar quantity
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## Other cards in this set

### Card 2

#### Front

is the stored ability to do work

Energy

### Card 3

#### Front

in a closed system where energy may be maybe converted from one form to another, but cannot be created or destroyed

### Card 4

#### Front

is the energy stored in an object by virtue of its position in a gravitational field

### Card 5

#### Front

is the work an object can do by virtue of it's speed