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# Elastic (Spring) Potential Energy Prezi

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## Gemma DZ

on 6 November 2014

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#### Transcript of Elastic (Spring) Potential Energy Prezi

By: Gemma
Elastic (Spring) Potential Energy
Potential Energy
Elastic Potential Energy
Hooke's Law
Example Problem #2
Elastic Potential Energy Formula
Cited Sources
The End
- Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing (Henderson)
- According to Hooke's Law, the force required to stretch the spring will be directly proportional to the amount of stretch (Georgia State University)
Known:
PE = 2 Joules
x = .35m
- PE. N.d. cmmap.orgWeb. 19 Mar 2013. <http://www.cmmap.org/images/learn/modeling/pe.jpg>.
- Potential energy is the stored energy of position possessed by an object (Henderson)
- There are THREE types of potential energy
2. Gravitational Potential Energy
1. Elastic Potential Energy
Source: http://www.cmmap.org/images/learn/modeling/pe.jpg
3. Chemical Potential Energy
Ex. Rubber bands, bungee chords, trampolines, springs, an arrow drawn into a bow, etc.
More Stretch
=
Greater Amount of Stored Energy.
F = -kx
k = spring constant - measure of the springs stiffness (units of N/m)
x = amount of stretch/compression (units of m)
Gives one the amount of force needed to stretch the spring
PE = potential energy (units of Joules)
k = spring constant (units of N/m)
x = amount of stretch/compression (units of m)
Source: http://www.physicsclassroom.com/class/energy/u5l1b6.gif
*NOTE: If a spring is not stretched or compressed, then there is no elastic potential energy stored in it. The spring is said to be at its equilibrium position. The equilibrium position is the position that the spring naturally assumes when there is no force applied to it. In terms of potential energy, the equilibrium position could be called the zero-potential energy position (Henderson)
For work to be done, an object must apply a force on another object causing its position to change (Henderson). When compressing or stretching a spring, the springs position is seen to alter due to that force. With the force being applied to the spring thus causing it to move this then means the spring has had work done to it.
How it Relates to Work
- . Physics 101, How Things Work. The University of Tennessee. Web. 18 Mar 2013. <http://electron6.phys.utk.edu/101/>.
Based off of the three photos above, which objects have an elastic potential energy and which ones do not? Why? Justify using evidence
Conceptual Example Problem #1
The objects in photos A and B have an elastic potential energy. Looking at A, the string is being stretched. With the string being pulled back it has the potential energy to fling the arrow forward. Now looking at photo B, the rubber band is also seen being stretched and has the potential to energy to snap back to its original shape. The object in photo C does not have elastic potential energy, as the object is neither being compressed or stretched.
A
B
C
Unknown:
k = ?
A rubber band has 2 Joules of elastic potential energy when stretched .35m. What is the spring constant (k) ?