Translation of the Latin Newton's 3rd law was written in: (from Wikipedia - http://en.wikipedia.org/wiki/Newton's_laws_of_motion#Newton.27s_3rd_Law ) "Law III: To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts."Can you give an example of a third law partner in regards to a situation when a 10kg object rests on the ground?
The 10 kg object exerts a force on the ground. The partner force would be that the earth is exerting a force on the object. The two forces are equal in magnitude, but oppositely directed.
I don't understand why you're having such a hard time with this.