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state Hooke’s law
before the limit of proportionality → x ∝ F

state the formula for force including force constant
F = kx
force (N) = force constant (Nm-1) x extension/compression (m)
define force constant
the stiffness of a spring
state the formula for the total force constant of springs in series
1/k = 1/k1 + 1/k2 + 1/k3…
state the formula for the total force constant of springs in parallel
k = k1 + k2 + k3…