Push and Pull 
Another force which may act on an object could be any physical push or pull. This could be caused by a person pushing a crate on the floor, a child pulling on a wagon, or in the case of our example, the horse pulling on the carriage. 

We will label the applied push (or pull) force with F.

Tension 

Tension in an object results if the pulling force acts on its ends, such as in a rope used to pull a boulder. 

If we say that our carriage is being pulled by a bar (by the horse) at its front end, then we can add this force to our FBD.

And there we have it: all the forces acting on our carriage have been labelled in this figure. This is the complete FBD for our problem of a carriage being pulled along a road.


 

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