A body is considered accelerated when its velocity is increasing, decreasing, or changing directions. Acceleration can be a gradual or instantanious change. The formula for acceleration is acceleration(a) = velocity(v) minus intial velocity(v0) divided by time(t).


Galileo Galilei observed objects rolling down several inclines and timed the events. He found out that the object's distance was proportional to time squared that it took to travel. This great step in motion led to Newton's second law, which shows that acceleration is an unbalanced force acting on an object; we now call this gravity. These useful discoveries were made in the late sixteenth, early seventeenth century.

Application of (ACCELERATION)

More often than not acceleration is thought of when talking about the speed of a car. Your speedometer would tell you how many miles you would go within one hour, if you keep that same speed. Also, police use a radar gun to clock your acceleration, or how fast you are going over or under the speed limit.


  1. Beiser, A. (1988). Physical Science (2nd Edition). New York, NY: McGraw Hill
  2. (//science.jrank.org/pages/8/acceleration-history.html)
  3. (Ref #3 - from book, library, journal)
  4. http://4.bp.blogspot.com/_bnPE0e1MTA4/TBt4ZFmSyaI/AAAAAAAAAAs/C1fChBRQnaM/s1600/acceleration.jpg [picture of rocket]

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