What is newton's second law of motion?
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The net external force acting on a particle is equal to the product of the mass and its acceleration.\n\nF = ma\nwhere, F = the net external force\n       m = the mass of the particle\n       a = the acceleration of the particle
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the newton's three laws of motion are as follows: law of inertia ( an object at rest will stay at rest unless acted by an outside force, a moving will continue on ots motion unless acted by an outside force), law of acceleration ( thw acceleration of a body is directly propotional the force and inversely proportional to its mass: a=f/m) and the law of interaction ( in every action there is always an equal and opossite rreaction)
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Einstein's law of gravitation. It certainly looks nicer than Newton's :P
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According to Newton's second law,\nF = m*a \nF = Force\nm = mass\na = acceleration\n\nnow, also,\n\na = (v-u)/t \nv = final velocity\nu = initial velocity\nt = time\n\nput this expression into first equation, you get\n\nF = m (v - u)/t\n= (mv - mu)/t\n\nalso, momentum = mass * velocity\n\nso,\nF = (final momentum - initial momentum)/t\n\nwe can also say that\n\nF = Rate of change of momentum
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If you're speaking of the motion of Earth on it's axis or it's rotation about the sun, the answer is the scientific principle of Inertia, read now!\n\nThe principle of inertia is one of the fundamental laws of classical physics which are used to describe the motion of matter and how it is affected by applied forces.Inertia is the property of an object to resist changes in velocity unless acted upon by an outside force.Inertia is dependent upon the mass and shape of the object. The concept of inertia is today most commonly defined using Sir Isaac Newton's First Law of Motion, which states:\n\nEvery body perseveres in its state of being at rest or of moving uniformly straight ahead, except insofar as it is compelled to change its state by forces impressed. [Cohen & Whitman 1999 translation]\n\nThe description of inertia presented by Newton's law is still considered the standard for classical physics. However, it has also been refined and expanded over time to reflect developments in understanding of relativity and quantum physics which have led to somewhat different (and more mathematical) interpretations in some of those fields.\n\nNow read more at the links below:
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Third law\n    To every action (force applied) there is an equal and opposite reaction (equal force applied in the opposite direction).\n    Another way of stating Newton's third law, an interaction between two objects, is that, if object A exerts a force on object B, object B will exert the same magnitude force on A, but in the opposite direction.
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Newton's Laws of Motion describe only the motion of a body as a whole and are valid only for motions relative to a reference frame. \nFirst law - An object at rest tends to stay in rest and an object in motion tends to stay in motion in a straight line at constant speed unless acted upon by an external, unbalanced force - like those big propellers. \nSecond law - The rate of change of momentum of a body is proportional to the resultant force acting on the body and is in the same direction. Which is why a really big submarine needs really big propellers to go.\nThird law - To every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction).   So if the propeller pushes against the water one way, the propeller and the ship it is attached to move the other way.
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Dynamics or laws of motion appear to have been developed to describe the motion of planetary bodies seen in the heavens.\n\nAristotle’s view of  motion tends towards the philosophical, it doesn’t lend itself to actually calculating the dynamic behavior of objects.\n\n - Like attracts like, so stones fall to the ground because they’re similar in substance, smoke goes up because it’s similar to air.\n - Natural state of an object is rest.\n - Constant velocity results from continuously applied force.\n - Masses fall at constant rates that are dependant upon their masses (feather vs rock)\n - Various other talk about pure heavenly substance (quintessence) that resulted in perfect (circular) motion.  Perfect motion is circular. \n\nNewton has his three laws, although these were built on ideas from Descartes, Galileo and others.  Inertia seems to originally have been Galileo’s idea.\n\nLaw of Inertia:  Every object in uniform motion remains in that uniform motion unless acted upon by an external force.\n\nLaw of Dynamics:  The acceleration of an object is proportional to the force applied to it.\n\nLaw of Reciprocal Actions:  When one body exerts a force upon a second body, the second exerts an equal and opposite force upon the first.\n\n\nNewton’s ideas are originally written in Latin, and they inlcude a number of other related ideas, corollaries and postulates.  Newton was analytical in his approach, meaning that he wanted to be able to calculate various quantities of mass, velocity and acceleration.  Galileo was more experimental, and Aristotle tended mostly towards the philosophical.  \n\nAlso, Aristotle’s writings on motion tend to be confusing, he mixes terms and uses different terminology, so it’s not clear exactly what he’s saying all the time.  Clear statements of Aristotle’s ideas on motion should always be a little suspect.
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http://en.wikipedia.org/wiki/Gravitation#Newton.27s_law_of_universal_gravitation
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Newton's First Law of Motion - every object continues in its state of rest or uniform velocity as long as no net force acts on it. There is no force acting to close the eyes.
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Newton.  Freely falling bodies fall at a constant rate. Distance/Time.
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Most popular Equation is... given by Newton..\n\nF = M A\nForce = Mass x Acceleration
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The unit of force is the Newton (N).\n\n1 newton is defined as the force needed to accelerate a 1kg object at 1m/s*2.(from Newton's 2nd Law of Motion: F = ma)   \n\nSometimes it is given in its base units as kgm/s*2
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This is really simple stuff. Newtons is force, seconds is time, meters is length, and meters per second is length per time, or velocity.
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Newtons is the unit for measure of force
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Newtons 3rd Law,\nFor every action, there is an equal and opposite reaction.\n\nSo all of the instances given, there is both an action and reaction force occuring.
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Basically the law you are talking about is the theory that an object in motion will stay in motion until another force acts upon it.\n\nMomentum is calculated by multiplying the mass by the velocity of the object.  There are many applications for these caclulations like if you wanted to find out what would happen in a head on collision between two objects.  You would be able to calculate in which direction the two objects would travel after the collision.\n\nAnyway, here is a website that I found for you that explains it completely.