Monday, November 5, 2018

newtonian mechanics - Can we do a thought experiment to prove that the horizontal and vertical motion of a projectile are independent of each other?


It seems really hard for me to grasp the idea that horizontal and vertical motion of a projectile are independent of each other. Intuitively I feel that they should affect each other. How can it be that a bullet fired horizontally from the gun and a ball dropped from the same height reach the ground at exactly the same time? Can anyone show me logically why this is true?





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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 \...