passage: In many parts of the world , trees lose their leaves in autumn .
  The leaves turn color .
  Then fall from the trees to the ground .
  As the leaves are falling , they have kinetic energy .
  While they are still attached to the trees they also have energy .
  When they are attached they are not in motion , so how can they have energy ?
  Instead of kinetic energy , they have stored energy .
  This stored energy is called potential energy .
  An object has potential energy because of its position .
  For example , leaves on trees have potential energy because they could fall .
  They fall because of the pull of gravity .
  Potential energy can be transferred into motion .
  Motion can also be turned back into potential energy .
  Objects have potential energy due to their position .
  A leaf on a tree branch has potential energy .
  The leafs energy can be turned into motion as it falls .
  Once the leaf is on the ground , it has no more potential unless it is lifted back up .
query_and_answer: What happens to trees in autumn ? || They hibernate
evidences: In many parts of the world , trees lose their leaves in autumn . The leaves turn color .