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The main difference between the Young's modulus (E) and the Spring's constant (K) is that Young's modulus refers only to the material, while spring stiffness refers to the structure. The spring consta …

During impact what usually happens is that a moving object with mass $m$ with an initial velocity $v_0$ stops (or rebounces) in a very short time $\Delta t$. Assuming a body stops during impact this m …

First of all the problem described --i.e. twisting then releasing -- seem like a dynamics problem (more than a statics one). Additionally, (and this will become more relevant below) is that the probl …

Assuming that: x=0 is the point where the spring is neither compressed nor extended x is positive upwards gravity plays a role then the motion equation is: $$m\cdot \ddot{x} + k\cdot x = -m\cdot g$ …

The way I understand it, this mechanism performs very much like the notched scroll wheel of some mice. Although, probably that is not seem to be the same size or transfer the same load as the one you …

IMHO, It provides a stiffener midway that does somewhat arrest the rotational capacity during the buckling. I.e. if it where not there the mid section would be able to rotate more, and therefore accel …

Question 1: If we don't pull the spring hard/far enough, when we release it it wouldn't provide much force. But if we stretch it too far, or keep it under tension for too long without firing, it woul …

To my understanding the Hartnell governor is a variation that might be applicable to your needs. Figure : HArtnell Governor source mechoholic Essentially it moves the sleeve against a compression spr …

The problems with the vacuum would be that the resulting force would always be less than 1bar times the cross-section. In a typical dampener the pressure of the N2 (or compressed air) is a few bars, …

I don't think either of the ways you are proposing with change the stiffness of the spring. What they will change is the starting value at compression (so you will immediately start from another point …

@Ben This is to answer the comment whether there are configurations that a hydraulic cylinder acts as a spring. Please Note that with the term hydraulic cylinder, I consider any cylinder with a hydrau …

I'll try to be a bit more verbose than the other answers. Essentially, I believe we should arrive at the same results (although I haven't checked). Like you have surmised, the temperature difference o …

Your proposed arrangement will probably not be ideal. putting a wooden board between the treadmill and the foam might make the board act as a speaker phone and make the noise more significant (in the …

It might seem simplistic, but if you have the option, you can drill a hole with a diameter slightly less than the spring and then pressure fit it inside the spring.

Provided your calculations are correct (you are not mentioning the mass that you will be launching) then you are right you need nothing more. However, I am not sure if its easy to find a constant forc …