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Formula
Force (f) = Spring constant (k) x spring (e)
Extension
The extension is directly proportional to the weight
Finding extension
Extension = extended length - Natural length
Natural length
Spring without load
Extended length
Spring loaded
Method
Measure natural length
Add 10N weight
Measure extended weight
Calculate extension
Add second 10N weight
Repeat
Apparatus
Helical spring
Slotted mass
Metre ruler