passage: What causes a change in motion ?
  The application of a force .
  Any time an object changes motion , a force has been applied .
  In what ways can this happen ?
  Force can cause an object at rest to start moving .
  Forces can cause objects to speed up or slow down .
  Forces can cause a moving object to stop .
  Forces can also cause a change in direction .
  In short , forces cause changes in motion .
  The moving object may change its speed , its direction , or both .
  We know that changes in motion require a force .
  We know that the size of the force determines the change in motion .
  How much an objects motion changes when a force is applied depends on two things .
  It depends on the strength of the force .
  It also depends on the objects mass .
  Think about some simple tasks you may regularly do .
  You may pick up a baseball .
  This requires only a very small force .
query_and_answer: What do you apply to an object to make it move or stop ? || Strength
evidences: Think about some simple tasks you may regularly do . Force can cause an object at rest to start moving . Forces can cause a moving object to stop .