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Deformation
change of shape and/or size of an object as a result of forces being applied
Conditions required to deform a stationary object
must be more than one force acting on the object
Extension
increase in length or size as a result of an object being stretched
Compression
reduction in length or size as a result of an object being squashed
Hooke's Law
extension of an elastic object is directly proportional to force applied, provided limit of proportionality is not exceeded
Limit of proportionality
point beyond which Hooke's law is no longer obeyed
F = ke
The equation linking force, spring constant and extension/compression
F
The symbol for force
k
The symbol for spring constant
e
The symbol for extension (or compression)
Unit for spring constant
Newtons per metre (N/m)
Unit for extension
Metres (m)
Spring constant
measure of the stiffness of a spring
Relationship between spring constant and extension
higher the spring constant, the stiffer the spring
Note 
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