Forces and elasticity

• Stretching, compressing or bending transfers energy

  • you need more than one force acting on an object for it to bend or Stretch
  • An object has been elastically deformed it it can go back to its origional form. Items that can do this are called elastic objects
  • An object has been in elastically deformed if it doesn't return to its origional shape
  • work is done when a force Stretches or compresses an object and causes energy to be transferred to the objects Epe store
  • It is elastically deformed, all the energy is transferred to the objects epe store
• Extension is directly proportional to force

  Force (1) = Spring constant (N/M) x Extention (m)

  • the extension of a stretched sprin is directly proportional to the force applied to it
• there's a limit to the amount of force you can apply to an object for the extension to keep on increasing proportionally. This is t limit of proportionality
• Investigating springs:

  1. Measure the natural length of the spring after you connect it to a clamp stand and measure its origional length using the fixed ruler
  2. Add a weight to the Spring and measure its extension (Change in length)
  3. repeat this process until you have enough measurements
  4. plot a force - extention graph of your results
• The work done in stretching a spring:

  EPe (J) = half the spring constant (N/M) x extention (m) squared
• When a spring is compressed, the same equation applies but with negative values.