the first principle of dynamics by mua dynamics is a field in physics dealing with the matter in motion with questioning the cause of the motion. as a most important law in this field there is the second Newton's law. but unfortunately this law is not valid. i want go thru reproving that claim again(i will only on your demand) but i'll only fill the vacuum caused with dismisal of this law. the new version of the basic principle of dynamics is as it follows: FdR > 0 where F = force, R = distance from the source of the force. it should be understood this way: The force F forces the object it acts upon on displacement dR in same direction of the vector of the force. if the object performs additional tangential displacement dx then there is additional force Fx that is causing it and Fxdx > 0 too. if you are asking me, this is the most importantoutstanding discovery ever and it will change the physics as you know it if implemented/accepted. what you do wrong actually is mistaking the speed with displacement. should i require reward for this? back to you.