forces and elsaticity

• what happens when a force is applied to an ovject

  it stretches compresses of bends
• why does more than 1 force need to applied to an object for it to stretch bend of compress

  • if there was only 1 force then the object would move in the direction of the force
• What is inelastic deformity

  • inelastic deformity is where hookes law no longer applies and after being stretched it doesn't return to it's original shape
• what is elastic deformity


  • where an object returns to it's orginal shalpe
• what is extension

  • the increased length of a string when it's stretched
• what is hookes law

  force = k(n/m) x extension

  springs constant is how much an object extends by 1m (how many newtons)

  higher springs constant stiffer material as more force is needed
• relationship between force and extension

  • as force increases so does extension (hookes law) and is elastic
  • when curves limit of proportionality occurs elastic limit and will be in elastically deformed
• explain hookels law

  f(force applied) = k (springs constant how elastic an object is) x e(how much it's been stretched)

  the lower the springs constant (k) the more elastic it is
• how to work out the energy transfered

  E= 1/2 k x x2 (1/2 springs constant x extensions squared)

  the energy transferred is under the graph before the elastic limit or proportionality mean while the gradient is the spring constant
• pratical on forces and elasticity

  • measure the length of the spring and attach a ruler to the stand
  • add mass to the spring on a hanging mass and measure the extension (change in length)
  • repeat this
  • plot on a graph