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====Valid Experiment====
: [[Hypothesis]] - The [[extension]] of a [[Coil Spring|spring]] is [[Directly Proportional|directly proportional]] to the [[force]] applied to the [[Coil Spring|spring]].
: '''Valid''' Method - Attach different known [[weight]]s to the [[Coil Spring|spring]] and [[measure]] the [[extension]] of the [[Coil Spring|spring]].
====Invalid Experiment====
: [[Hypothesis]] - The [[extension]] of a [[Coil Spring|spring]] is [[Directly Proportional|directly proportional]] to the [[force]] applied to the [[Coil Spring|spring]].
: '''Invalid ''' Method 1 - Attach different known [[weight]]s to an elastic band and [[measure]] the [[extension]] of the elastic band.
: '''Invalid ''' Method 2 - Attach different known [[weight]]s to the [[Coil Spring|spring]] and [[measure]] the [[width]] of the [[Coil Spring|spring]].
: '''Invalid ''' Method 3- Pull the [[Coil Spring|spring]] with the hands and [[measure]] the [[extension]] of the [[Coil Spring|spring]].
: '''Invalid ''' Method 4 - Attach different known [[weight]]s each to a different [[Coil Spring|spring]] and [[measure]] the [[extension]] of each [[Coil Spring|spring]].