# Forces 3b

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- Created by: sophie.rebecca_
- Created on: 16-04-16 08:50

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- Forces 3b
- 8a) Define the term, 'elastic':
- Something that will return to its original shape after being stretched.

- 8b) What happens to energy when work is done on an elastic object by a stretching force?
- Elastic potential energy is stored in the object as the object is stretched, when released the energy changes to kinetic and a little heat.

- 9) How do you calculate extension from a length?
- Extension=current length-original length.

- 10) Describe how a spring extends in terms of the forces acting upon it:
- As the force on the spring increases, the extension increases, as it is directly proportional as long as it has not exceeded its limit of proportionality, according to Hooke's Law. On a graph, the line would be straight with a positive gradient.

- 11a) What is 'Spring constant'?
- The amount of force per unit of extension to extend a spring.

- 11b) How do you calculate the extension using the Hookes law formula?
- Force(N)=Spring constant(N/m)*extension(m)

- 12) Describe the force-extension graphs for a spring, a rubber band and a polythene bag:
- Spring, straight positive gradient until limit of proportionality.
- Rubber band is curved, the force doubles, the extension more than doubles.
- Not directly proportional, stretches slowly to begin with, then very quickly (opposite to rubber band)

- 8a) Define the term, 'elastic':

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