They are naturally at rest in a tightly coiled, compressed position, contain the most potential energy when someone steps onto the trampoline and extends them, and they release that energy as they tighten up again (pulling the canvas taut and flinging the jumper into the air).
The springs used on trampolines are an example of extension springs. The springs on a pogo stick are an example of compression springs they are naturally at rest in the extended position, contain the most potential energy when compressed, and release that energy as the springs extend back to their natural position (which softens the impact of bouncing up and down). Still confused? Here is an example of each: The “compression” and “extension” names refer to the state in which the springs contain the most potential energy compression springs have the most potential energy when they are compressed, and extension springs have the most potential energy when they are extended. Extension springs are coiled more tightly than compression springs, while both may have hooks or loops on either end to attach to other objects. These helical mechanisms are most often made of metal, but occasionally are made of other materials as well. Two of the most common types of springs are compression and extension springs. Different types of springs: compression, extension, torsion, & constant force springs Elastic materials are those that are able to spontaneously regain their normal or “relaxed” shape after force is applied. Indeed, if something is described as “Hookean,” it means that a proportional relationship exists for an elastic material or body. Because of this, Hooke’s Law is used in almost all of the sciences, and has broad application in the engineering world as well. Hooke’s law holds for most solid bodies, as long as the forces are small enough and large deformations do not occur. The spring constant ( k ) is a function of the material’s properties, coil thickness, and the number of turns in the coil. 
Where F is the force, k is the spring’s stiffness (a constant), and x is the distance. This relationship is expressed by the equation Robert Hooke was a British physicist who stated that there is a proportional relationship between the force required to extend or compress a spring, and the distance that the spring is extended or compressed. In this article, we’ll discuss the principle behind most springs, four different types of springs, and some popular applications where springs are used.
While helical (coiled) springs are typically what comes to mind, springs come in many shapes and materials, such as a wooden bow (used with arrows) or serpentine springs (made of wire and used in furniture). Springs are incredibly common, and can be found in virtually every industry. At their most basic definition, springs are devices that store mechanical potential energy.
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