Problem
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Consider two springs with different spring constants $ k_1 $ and $ k_2 $.
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Part 1: Determine the equivalent spring constant when the two springs are connected in series.
Photolinker 3 5 13 download free. Part 2: Determine the equivalent spring constant when the two springs are connected in parallel.
Solution
Part 1: Springs connected in series (same forces, different length)
When two springs are connected in series, the result is essentially a longer and flimsier spring. When a force is applied to the combined spring, the same force is applied to each individual spring. Since the springs have different spring constants, the displacements are different. Thus we get three equations:
- $ {F}_{app} = {k}_{eq} (x_1 + x_2) $
- $ {F}_{app} = k_1 x_1 $
- $ {F}_{app} = k_2 x_2 $
First equate equations 2 and 3 and isolate for $ x_2 $
- $ k_1 x_1 = k_2 x_2 $
- $ x_2 = frac{k_1 x_1}{k_2} $.
Artstudio pro 1 2 2 download free. Substitute $ x_2 $ into equation 1.
- $ {F}_{app} = {k}_{eq} left( x_1 + frac{k_1 x_1}{k_2}right) $
- $ {F}_{app} = {k}_{eq} left( 1 + frac{k_1}{k_2}right)x_1 $
To solve for the equivalent spring constant, set the above equation with equation 2. The strategy is to divide away $ x_1 $.
- $ {k}_{eq} left( 1 + frac{k_1}{k_2}right)x_1 = k_1 x_1 $
- $ {k}_{eq} = frac{k_1 k_2}{k_1 + k_2} $
In general, given $ n $ springs added in series
- $ frac{1}{{k}_{eq}} = frac{1}{k_1} + frac{1}{k_2} + frac{1}{k_3} + .. + frac{1}{k_n} $.
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Part 2: Springs connected in parallel (same length, different forces)
When two springs are connected in parallel, the result is essentially two springs working together. When a force is applied to the combined spring, the force applied on each individual spring is different. Thus we get three equations:
- $ {F}_{1} = k_1 x $
- $ {F}_{2} = k_2 x $
- $ {F}_{app} = {k}_{eq} x = F_1 + F_2 $
Thus
- $ {k}_{eq} x = k_1 x + k_2 x $
- $ {k}_{eq} x = (k_1 + k_2) x $.
Therefore,
- $ {k}_{eq} = k_1 + k_2 $.
In general, given $ n $ springs added in parallel
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- $ {k}_{eq} = {k}_{1} + {k}_{2} + {k}_{3} +.. + {k}_{n} $.