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Cougar – Member
If it takes 7k to compress the – I'm going to say 'spring' here as it's easier for me to picture – then two springs end to end will still take 7k, the strength of the spring doesn't magically change.
What does change, and what muddies the thinking, is that the distance travelled for a given force will double.
(standard disclaimer)
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(can't work out how to quote, sorry)
Well, yes and no – if you take a 7N/mm spring and chop it in half, it becomes a 14N/mm spring. If you make a spring exactly the same as the 7N/mm spring, but twice as long, then it becomes half as stiff, or 3.5N/mm
if you don't believe me go and find a plastic ruler, and hold it at one end and bend it. now hold it halfway along, it will be twice as hard to move the same distance. a coil spring is a straight spring wound in a helical shape.
distance travelled for given force will double – yes, because the spring rate is now halved.