2006-12-01 03:44:36 · 6 answers · asked by NAVEEN S 1 in Science & Mathematics ➔ Physics
Limitations on Newton's 2nd Law
One of the best known relationships in physics is Newton's 2nd Law
but, though extremely useful, it is not a fundamental principle like the conservation laws. F must be the net external force, and even then a more fundamental relationship is
The net force should be defined as the rate of change of momentum; this becomes
only if the mass is constant. Since the mass changes as the speed approaches the speed of light, F=ma is seen to be strictly a non-relativistic relationship which applies to the acceleration of constant mass objects. Despite these limitations, it is extremely useful for the prediction of motion under these constraints.
2006-12-01 04:00:57 · answer #1 · answered by deep s 2 · 0⤊ 0⤋
Newton's second law of motion, as originally stated, said that acceleration was proportional to force. This was limited by relativity. That is, it was only valid at velocities much smaller than the speed of light. The modern statement is that force is proportional to the rate of change of momentum, and this is not limited by relativity.
2006-12-01 03:48:14 · answer #2 · answered by DavidK93 7 · 0⤊ 0⤋
Kepler's 3 rules could have been Newton's commencing ingredient. He choose a manner of explaining why they carry. the respond is that the rigidity conserving the planets around the solar is an inverse sq. regulation. From that attending to Newtonian Mechanics is quite right away forward (you desire calculus yet that became on its way regardless of if Newton did create it independently) so which you'll be able to desire to respond to you question, particular it did.
2016-12-14 10:25:30 · answer #3 · answered by ? 4 · 0⤊ 0⤋
The velocity, in the selected frame of reference, must be significantly lower than the speed of light. This is not a big restriction, since one can choose any frame of refernce one pleases.
2006-12-01 03:48:10 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Relativity. At high speeds it gets increasingly inaccurate.
2006-12-01 03:47:57 · answer #5 · answered by campbelp2002 7 · 0⤊ 0⤋
You have to adjust for acceleration because mass its constant, constant as in the mass of an object will be the same here as it will be on the moon,the weight will be different. Therefore you have to adjust for acceleration. F= ma.
2006-12-01 03:52:20 · answer #6 · answered by Anonymous · 0⤊ 2⤋