linear relationship - A mathematical description of how one variable increases at the same rate as the other does., direct proportion - A relationship between two variables shown by a straight line on a graph. For a linear relationship the line does not have to go through the origin., non-linear relationship - A relationship between two variables that does not produce a straight line on a graph., Hooke’s Law - A law which states that the size of deformation or extension is directly proportional to the size of the deforming force or load., extension - The amount by which a spring or other stretchy material has stretched. It is worked out from the stretched length minus the original length., elastic - An elastic material changes shape when there is a force on it but returns to its original shape when the force is removed., inelastic - An inelastic material changes shape when a force is applied but does not return to its original shape when it is removed., work done - The mechanical energy transferred by forces.,

Forces & Matter

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