newtons law of action & reaction?
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put your self on a weighing scale. your weight is registered because the scale reacts the same amount as your weight. if your weight is greater than the capacity of the weighing scale then, that is no longer in the state of equilibrium.
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N is Newtons, a unit that measures force. For every 1kg of something, if it accelerates at 1 meter per second per second (m/s/s or meters per seconds squared), than there is a force of 1N acting on it.\n\nForce is calculated by multiplying the mass (not weight) with the acceleration. For example, if you are 75kg, than there is a force of 75kg X 9.8 m/s/s (acceleration due to gravity: roughly constant on Earth) = 735N pulling you down. BUT, there is a reaction force, in this case the NORMAL, pushing you back up at the same time and force. Therefore, the force pulling you down, 735N, take away the NORMAL, also 735N, and you will have a NET FORCE of 0N because you are stationary. \n\nSo in order to resist something pulling at 14N (ignoring air resistance, friction, etc), it needs to pull back 14N.
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The second law of motion states that Force = mass * acceleration, or in other words, that force is directly proportional to acceleration.\n\nThe first law follows because it states that an object at rest or in uniform motion will stay that way unless a force acts upon it. Being at rest or in uniform motion means acceleration is zero. Anything times zero is zero, so no acceleration means no force, and vice-versa.
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All three Newton laws are real. They do support other two law, there is no conflict in them.
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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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C'mon, kid.  Go and read your book and do your homework.  I can understand if you are having problems with one problem, but you are posting this so that others will do your learning for you.  This is simple Newtonian physics.  Three laws you have to work with.  Basic, basic concepts.  If you can't handle this, then might as well give up your dreams of becoming a rocket scientist where you have to deal with special relativities and zero-gravity physics.  \n\nNow get moving!
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Forces occur in pairs. Newtons third law.\nIf this is the case the forces exist as equal and opposite.\n [Fo ]=[-Fi]\nNet force = Fo minus Fi= zero!\n  Moving forces can be directional and vectorial.\nAlso they change continueously during the motion till they Atenuate at the end of their cycle.To identify the force you have to identify the power that has cause the motion of the mass and the direction of interaction. The power causing the motion is always equal to the magnetude of the force multiplied by the the speed that the force moves.\n\nCurvilenear motion indicates that the power of two moving masses interact and cause the two masses to move around a common pivot point. Thus the masses are locked together into an orbit forming a composite mass structure.In that case the moving masses experience a curved path.\nThan you have to understand what is  a circle. A circle consists of an infinite integral of short straight lines, and each straight line having different direction.\n\nDont feel bad if you cant fully understand why. . I dont find it easy myself.
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force=mass*acceleration\nforce/area=pressure (usually measured in p.s.i. [pounds per square inch])
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http://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation
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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.\n\nIn an exact original 1792 translation (from Latin) Newton's Second Law of Motion reads:\n\nLAW II: The alteration of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed. — If a force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once, or gradually and successively. And this motion (being always directed the same way with the generating force), if the body moved before, is added to or subtracted from the former motion, according as they directly conspire with or are directly contrary to each other; or obliquely joined, when they are oblique, so as to produce a new motion compounded from the determination of both.\n\nNewton here is basically saying that the rate of change in the momentum of an object is directly proportional to the amount of force exerted upon the object. He also states that the change in direction of momentum is determined by the angle from which the force is applied.\n\nHowever, it must be remembered that for Newton, mass was constant and independent of velocity. To take "motion" (motu) as meaning momentum gives a false impression of what Newton believed. Since he took mass as constant (part of the constant of proportionality) it can, in modern notation, be taken to the left of the derivative as . If  is dependent on velocity (and thus indirectly upon time) as we would now hold, then  has to be included in the derivative, giving  or .\n\nUsing momentum in the terminology (which would never have occurred to Newton) is a latter-day revision of the law to bring it into correspondence with special relativity.\n\nInterestingly, Newton is restating in his further explanation another prior idea of Galileo, what we call today the Galilean transformation or the addition of velocities.\n\nAn interesting fact when studying Newton's Laws of Motion from the Principia is that Newton himself does not explicitly write formulae for his laws which was common in scientific writings of that time period. In fact, it is today commonly added when stating Newton's second law that Newton has said, "and inversely proportional to the mass of the object." This however is not found in Newton's second law as directly translated above. In fact, the idea of mass is not introduced until the third law.\n\nIn mathematical terms, the differential equation can be written as:\n\n \nwhere  is force,  is mass,  is velocity,  is time and  is the constant of proportionality. The product of the mass and velocity is the momentum of the object.\n\nIf mass of an object in question is known to be constant and using the definition of acceleration, this differential equation can be rewritten as:\n\n \nwhere  is the acceleration.\n\nUsing only SI Units for the definition of Newton, the constant of proportionality is unity (1). Hence:\n\n \nHowever, it has been a common convention to describe Newton's second law in the mathematical formula  where  is Force,  is acceleration and  is mass. This is actually a combination of laws two and three of Newton expressed in a very useful form. This formula in this form did not even begin to be used until the 18th century, after Newton's death, but it is implicit in his laws.
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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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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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1.Objects at rest tend to remain at rest, and objects in motion tend to remain in motion in a straight line at constant speed.  2. Force=Mass times Velocity. 3. Every action has an equal and opposite reaction.
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Newton's laws of motion only apply to systems that are larger than atomic and molecular. They definitely DO NOT apply to any atomic or molecular systems. Microscopic systems, yes. Macroscopic systems, yes. Sub-microscopic systems (sub-visual), no.
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newtons are the unit of force.  the second law of motion says that F=ma, where F is the force, m is the mass and a is the acceleration of the mass.   so, you need to know the acceleration!\n\nif you are talking about an object on earth, then the acceleration is "g", which is 9.8 m/s^2.  so multiply the mass times that acceleration to get the force with which gravity pulls on that object, in newtons.
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Inertia\n\nOne of Newton's Laws - Objects in Motion tend to remain in motion unless acted upon by an outside force such as gravity.
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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.