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Hooke's Law

Hooke's Law. Noadswood Science, 2012. Hooke’s Law. To know Hooke’s law. Watermelon (To Face). Forces. A force acting upon an object may cause a change in shape of the object…. Some objects are able to recover their original shape when stretched (but some or not, if stretched too far)!.

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Hooke's Law

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  1. Hooke's Law Noadswood Science, 2012

  2. Hooke’s Law • To know Hooke’s law

  3. Watermelon (To Face)

  4. Forces • A force acting upon an object may cause a change in shape of the object… • Some objects are able to recover their original shape when stretched (but some or not, if stretched too far)!

  5. Hooke’s Law • When a force is applied to an object it may be able to stretch and change its shape • Any object which can go back to its original shape after the force has been removed is an elastic object • Work is done to an elastic object to change its shape – this energy is not lost but stored as elastic potential energy • The elastic potential energy is then converted into kinetic energy when the force is removed and the object returns to its original shape…

  6. Experiment • Your task is to investigate Hooke’s law… • You need to work out the spring constant (k) for each of the springs • The following equation will help: - F = k x e • Where F = force; k = spring constant; and e = extension • k = F ÷ e (so in this experiment using a known force divided by the extension of each spring will give the spring constant for each spring in the experiment)

  7. Extension • The extension of a stretched spring is directly proportional to the force applied F = k x e • F = force (N) • k = spring constant (N/m) • e = extension (m)

  8. Force Too Great • There is a limit to the amount of force that can be applied to an object for the extension to keep increasing proportionally • For small forces the force and extension are proportional, however there is a maximum force that elastic objects can take and still extend proportionally – this is the limit of proportionality (point P) • If the force is increased past this limit the material becomes permanently stretched

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