Why we Turn to Handle While Close the Doors?




                           Firuge-1                                                                 Figure-2

              While we close the door the frame of the door applied a force to the door's tongued. The force causes that the tongued is pushed inside the door mechanism. To the tongued is pushed, there has to be a curve with θ. The first calculation is to find the applied normal force on the surface of the tongue because the other force is parallel to the surface of the tongue and it does not push the tongue.  (Figure-1).  After finding the normal force, the second step is finding the horizontal component of it to find the net force to push the tongue. (Figure-2). The calculations show that whenever θ-angle change the rate of Fpush and F, applied by the frame of the door is change, too. and the best angle, we need to apply less force to close the door, is 45-degree (Figure-3).  


                                                                          Figure-3

 The study shows that small forces can be used to keep bigger forces by using static systems. 

In my study, there was at least 2 times bigger force keeping capacity of the system. 

If we turn the handed the needed force to more tongue is getting smaller than the spring which pushes the tongue to outside the door mechanism. The rate of forces needed to open the door, between turning the handle or not is 1/4, which means that if you don't turn to handle you will apply 4 times more force to close the door than close the door by pushing the door without turning the handle.  The power of the static systems.

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