Answers

2014-06-08T14:05:11+08:00
If total vector addition of all acted forces equal to zero object stay in place 
in other case object goes to the greater acted force side.

..or resistance keeps an object in place, this resistance can come from Friction, whick work against motion or from an obstacle of some kind that is prohibiting movement. 
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2014-06-08T14:07:54+08:00
Inertia,It is stated in Mr. Isaac Newton's First Law of Motion (Law of Inertia).
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