Newton’s three laws describe?
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Newton's First Law of Motion:\n 1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.  \n\nNewton's Second Law of Motion:\n 2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.  \n\nNewton's Third Law of Motion:\n 3. For every action there is an equal and opposite reaction.
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Newton's third law: law of reciprocal actions\n \nAll forces occur in pairs, and these two forces are equal in magnitude and opposite in direction. \n\n\nThe third law follows mathematically from the law of conservation of momentum.
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I found the Wikipedia's article on Newton's method to be very good:\n\nhttp://en.wikipedia.org/wiki/Newton's_method
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Newtons law is called the Laws of Motions. There are three laws for it. The first law is known as the  "law of inertia" states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Basically if objects are not at equilibrium they do not accelerate, they only accelerate if there is a net or unbalanced force acting upon it. The second law is mainly about the behavior of objects. That all existing forces are not balance. It states thatacceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The third law is known as " for every action there is an equal and opposite reaction " this basically states that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
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http://en.wikipedia.org/wiki/Gravitation#Newton.27s_law_of_universal_gravitation
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its newtons first law, (objects in rest stay at rest unless a force is acted upon it which causes acceleration) and objects in motion stays in motion\n\naka intertia keeps the smaller peices moving in the same direction
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Newton's Laws of Motion:\n\nI. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.  \n\nII. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.  \n\nIII. For every action there is an equal and opposite reaction.
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try the formulas:\n\nforce = mass * aceleration\n\nwork = force * distance\n\n\n\n\nWell i dont speak english very well, but i hope i help u.\n\nKisses
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1- gravity , elastic forces (as in bows and catapults), Archimedes' push   - In Galileo time was discovered air pressure (Torricelli experiment) \n\n2- Mass \n\n3- Forces add up for the same mass, then acceleration also adds up :   F1 is force from friend 1, A1 is acceleration/thrust  given by him  \nF1= m.A1 \nF2= m.A2\n\nF1 + F2 = m. (A1 + A2)
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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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A newton is the amount of force required to accelerate a mass of one kilogram at a rate of one meter per sec per sec.\nDescription of Motion in One Dimension \nMotion is described in terms of displacement (x), time (t), velocity (v), and acceleration (a). Velocity is the rate of change of displacement and the acceleration is the rate of change of velocity. \n In order to derive new equations that can be used to describe the motion of an object in terms of its three kinematic variables: velocity, displacement, and time. There are three ways to pair them up: velocity-time, displacement-time, and velocity-displacement. In this order, they are also often called the first, second, and third equations of motion, but there is no compelling reason to learn these names. Since we are dealing with motion in a straight line, the symbol x will be used for displacement. Direction will be indicated by the sign (positive quantities point in +x direction, while negative quantities point in the -x direction). Determining which direction is positive and which negative is entirely arbitrary. The laws of physics are isotropic; that is, they are independent of the orientation of the coordinate system. As long as you are consistent, it doesn't matter. Some problems are easier to understand and solve, however, when one direction is chosen positive over another.\n\nvelocity-time\nThe relation between velocity and time is a simple one during constantly accelerated, straight-line motion. Constant acceleration implies a uniform rate of change in the velocity. The longer the acceleration, the greater the change in velocity. If after a time velocity increases by a certain amount, after twice that time it should increase by twice that amount. Change in velocity is directly proportional to time when acceleration is constant. If an object already started with a certain velocity, then its new velocity would be the old velocity plus this change. You ought to be able to see the equation in your mind's eye already.\n\nThis is the easiest of the three equations to derive formally. Start from the definition of acceleration, expand the Δv term, and solve for v as a function of t.\n\n          \na =  Δv  =  v − v0         \n  \nΔt Δt \n          \nv =  v0 + aΔt     (1) \n                  \n\nSince acceleration is also the first derivative of velocity with respect to time, this equation can also be derived using calculus. Just reverse the action of the definition. Instead of differentiating velocity to find acceleration, integrate acceleration to find velocity. Since acceleration is assumed constant, this is quite easy.\n\n          \n  a =  dv                     \n \ndt \n  dv =  a dt \nv   Δt     \n∫  dv =  ∫  a dt               \nv0   0     \nv − v0 =  aΔt  \n  v =  v0 + aΔt     (1) \n          \n\nThe symbol v0 (v nought) is called the initial velocity. It is often thought of as the "first velocity" but this is a rather naïve way to describe it. Take the case of a meteor hurtling towards the earth. What is its initial velocity? If you want v0 to be the first velocity, then the problem is over before it started. Who could possibly say what a meteor's velocity was at its birth? There is no way to answer this question. A better definition would be to say that an initial velocity is the velocity that a moving object has when it first becomes important in a problem. Say the meteor was spotted deep in space and the problem was to determine its trajectory, then the initial velocity would be the velocity at the time it was observed. But if the problem were to determine its velocity on impact, then it's initial velocity would more likely be the velocity it had when it entered the earth's atmosphere. In this case, the answer to, "What's the initial velocity?" is "It depends". This turns out to be the answer to a lot of questions.\n\nThe symbol v is then the velocity some time Δt after the initial velo
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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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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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The magnitude of a force is measured in newtons(N)
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Newtons 3 laws of motion say:\n1) An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.\n2)F=MA or force = mass times acceleration. It describes how an unbalanced force acts in the first law. THIS IS THE MOST IMPORTANT DISCOVERY IN ALL THE HISTORY OF SCIENCE!!!!!\n3) For every action, there is an equal and opposite reaction.\n\nNewton also discovered that gravity is a force of attraction between two masses that is equal to the product of the two masses times the gravitational constant divided by the square of the distance between them. Or F=GMm/R^2.\n\nThe combination of all of the above explains all orbits, rocket propulsion, life the universe and everything!\n\n\nThen Einstein comes along and messes it all up. He says that there is a small error in Newton's laws that depends on the speed. For stuff going really fast, Newtons laws are just totally wrong. Gravity isn't even a force at all, it is a curvature in space time.\n\nBut for every day applications, like designing a 747 or computing the path of an artillery shell or a zillion other things, Newtons laws are still used as is because the errors are vanishingly small under normal conditions.
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Newton's Laws of Motion:\n\nI. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. \n\nII. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.\n\nIII. For every action there is an equal and opposite reaction. \n\nThe link below explains each one very well.
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F = ma\n\nF - Force\nm - mass\na - acceleration