Wednesday, April 25, 2018

newtonian mechanics - Instantaneous cause




The position of an object has a rate of change called velocity. The velocity of an object has a rate of change called acceleration.


Force applied is proportional to the acceleration of the body (according to Newton). However it is known that a force can't be applied instantly. So acceleration has a rate of change too (called?).


Will the cause of the "force acceleration" also have a rate of change? Is this infinite, meaning that there will be always something accelerating something else, or is there any cause in nature that is truly instant?


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Edit. To make myself more clear. Is there acceleration of the jerk? Is there acceleration of the acceleration of the jerk, and so on...




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...