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Regents Physics

Regents Physics. Springs. Some Kinds of Springs. Elastic Potential Energy. Energy is stored in a spring when work is done stretching or compressing it This energy is called elastic potential energy. Compression / Elongation.

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Regents Physics

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  1. Regents Physics Springs

  2. Some Kinds of Springs

  3. Elastic Potential Energy • Energy is stored in a spring when work is done stretching or compressing it • This energy is called elastic potential energy

  4. Compression / Elongation • The compression or elongation of a spring is the change in spring length from it’s equilibrium position when a force is applied to it • The compression (elongation) of the spring is directly proportional to the applied force…provided the elastic limit of the spring is not exceeded

  5. Elastic Potential Energy • Elastic potential energy is the energy available for use when a deformed elastic object returns to its original configuration. • The symbol k is called the spring constant, a parameter that measures the spring’s resistance to being compressed or stretched.

  6. Spring Constant

  7. Veritcal Moving Spring • Questions to think about • Where is the elastic potential energy the max? The min? • Where is GPE max? • Where is EPE max? animation

  8. Horizontal Moving Spring Horizontal springs don’t contain gravitational potential energy in the system Click for animation

  9. EPE Practice Problem A spring with a spring constant of 10 N/m is stretched 0.20 meters from it’s rest position. What is the potential energy stored in the spring? 1. Write Knowns/Unknown 2. Find equation/solve k = 10 N/m EPE = ½ kx2 x = 0.20 m EPE = ½ (10N/m)(0.20m)2 EPE = ? EPE = 0.2 J Click for solution

  10. Hooke’s Law Fs = kx The applied force on a spring is proportional to the distance the spring is displaced (x) and the spring constant (k) k is the spring constant and is the constant of proportionality between the applied force and the compression/elongation of the spring Unit is the Newton / meter

  11. Hook’s Law Practice Problem

  12. Hook’s Law Problem #2

  13. Combination Problem with Springs • Gravitational potential energy and kinetic energy can turn into elastic potential energy Question: Describe the energy transformation that occurs during the blocks motion End

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