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PHY100 Writing 1 - Assignment Example

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PHY100 Writing 1

Changes in energy occur to the rubber band when it is stretched (application of force) and when it is in unscratched state.
Hooke’s Low can be used to demonstrate the changes that take place in a rubber band when it is stretched. Hooke’s law states that “the amount of force applied to an elastic object is proportional to the amount of deformation (stretch or compression) that the object undergoes” (Breithaupt, 77). This is why when more force is applied on a rubber band, the stretch increases and when a little force is applied, there is little stretch. This principle can be presented in the following equation where F represents the applied force, k represent the force constant of the rubber band and x is the length of the stretch recorded. In the equation below, the force applied is proportional to the amount of deformation on the rubber.
Despite the fact that a rubber band is elastic and can stretch when more force is applied, the rubber band only stretches up to a certain limit. Robert Hooke also noted that elastic objects stretches until they reach elastic limit also referred to as yield limit. Beyond this point, the rubber band exhibit plastic deformation and can no longer return to their original shape when the stretch force is removed. Plastic deformation occurs on the rubber band because beyond maximum stretch force, application of extra force results into breaking of limited number of atomic bonds holding together rubber band molecules (Fan & Zhu, 28). This explains why certain parts of the rubber band stretched more than the other parts. These parts that stretched more the other parts must have underwent plastic ...Show more

Summary

In a piece of rubber band, the molecules are all tangle up with each other when in outstretched state. When a rubber is stretched however, it loses its original shape because the curled molecules are driven apart. The…
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