Answers

2014-07-04T14:47:02+08:00
When you drop a ball on the floor, the ball exerts the action force on the floor and the floor exerts reaction force - equal but the opposite. 

Then someone push the wall (action), it exerts the force (reaction).

I hope it was helpful. Generally Newton 3rd law says that when there is an action, there is a reaction with equal opposite force. 
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