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• The quantity of elastic potential energy (or just elastic energy) stored in such a device is proportional to its extension; the greater the extension or deformation, the greater the elastic potential energy stored.

• What's interesting is that for some materials, the elastic force exerted by the elastic object is directly proportional to the external force used to deform it

• An inelastic deformation occurs when the object is permanently deformed and does not return back to its original position.

• To explain this there are two types of deformation that occur: elastic deformation and inelastic deformation

• An elastic force is a force that brings certain materials back to their original shape after being deformed.

• Now after it's compressed another force brings the spring back to its original position. What is this restorative force called? and how do we know how much force is required to compress a spring? The answer is elastic forces.

• The spring cannot push you higher by itself, you need an external force that compresses the spring

• What's interesting is that your body weight is the force that is responsible for compressing the spring

• When an external force acts on an object it can be deformed by compression

• (compressing a spring)

• bending (bending a plastic ruler)

• But remember, there must always be more than one force acting to modify the shape of a stationary object

• or elongating (elongating a rubber band).

• This is because elastic forces are only produced by materials or shapes that are elastic in nature. Such materials are called elastomers

• For example, a stretched rubber band will move back to its original shape once the force that's stretching it is removed.

• To explain this there are two types of deformation that occur: elastic deformation and inelastic deformation.

• Elastic deformation occurs when the object returns back to its original shape after the forces are withdrawn.

• Now, can we connect this with any of Newton's laws of motion? Yes, Newton's third law states that: Every action has an equal and opposite reaction

• Every action has an equal and opposite reaction

• The elastic force is nothing but the equal and opposite reaction to the external deforming force