What is the third law of motion?
147137
Newton's Law of motion\n----------------------\n\n"FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION"\n\nThis law is applicable in each and every day action like walking, firing bullets to lanching rockets.\n\nThe force we given to the floor while walking resulted in a opposite force from the floor which moves us forward.
1017218
Dr. Isaac Newton proposed the 3 Laws of Motion, as below:\n\nFirst law:\nObjects in motion tend to stay in motion, and objects at rest tend to stay at rest unless an outside force acts upon them.\n\nOr simply, a force is required to move a stationary object or to stop a moving object.  \n\nSecond law:\nThe rate of change of the momentum of a body is directly proportional to the net force acting on it, and the direction of the change in momentum takes place in the direction of the net force.\n\nOr simply, a body moves along the direction of application of the force.\n\nThird law:\nTo every action (force applied) there is an equal and opposite reaction (equal force applied in the opposite direction).\n\nOr simply, there is always a reaction for any action. Egs: Due to Friction (reaction) only, we are able to walk (action).; Rocket shoots up (action) due to the reaction of the hot gases that expend through the nozzle downwards.
503067
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.
918434
One of the basic principles of physics (Newton's Third Law) is that for every action (force) there is an opposite and equal reaction (force). The principle of a rocket motor may be understood by considering the example of a closed container filled with a compressed gas. Within this container the gas exerts equal pressure on every point of its walls. If a hole is punched in the bottom of the container, however, the gas at the bottom escapes and the pressure against the top of the container is no longer equalized. The internal gas pressure then pushes the container upwards in reaction to the jet of air escaping downwards. The amount of thrust developed by a rocket motor depends mainly on two factors, the velocity with which the burning gases leave the combustion chamber, and the mass of the burning gases.
666644
I don't know how so many people are confusing the first law of motion with the second law of motion. People, she's asked for the second 'theory' of motion, which is to be understood, of course as the second law of motion. Which states that the rate of  change of momentum is directly proportional to the impressed force and takes place in the direction of the force. \n\nThe proof of that cannot be derived from first principles, as it is one of the first principles itself. Of course, for a special case in which the system mass is constant, it does reduce to F = ma, but that is really elementary.
282006
Answer is 'acts in the direction opposite of motion."\n\nFriction always opposes motion. Therefore first one is wrong.\nFriction is equal to mu times the weight. and mu is not equal to one.Therefore second  one is wrong.\n Sliding friction is less than static friction\nTherefore Third   one is wrong.
788162
All three Newton laws are real. They do support other two law, there is no conflict in them.
65284
Motion is produced by any force, that could be wind, or  a person applying force to an object, or any other kind or force. motion is stopped when the force that is applied to it stops.
869773
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.
1042891
They don't call it a Law for nothing you know.\nWherever you look, you will always see an action-reaction paired up.  Newton's 3rd Law fits nicely in with another law which we know holds true in all cases...the Law of conservation of momentum.
549497
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.
515336
Newton's third law was the first incarnation of an important principle of physics (still valid of course) called the law of momentum conservation.\n\nIt's regarded as a consequence of other physical laws rather than a postulate as in Newton's theory. In particular it follows mathematically from the assumption that laws of physics are unchanged under translations - that space is homogeneous.\n\nIn Newton's system, the momentum lost/gained by one material object instantaneously appears or disappears in other distant objects. In that sense it's not true except as an approximation because special relativity does not allow anything to propagate faster than the speed of light.\n\nThe modern view is that there's an exchange of momentum between matter and fields rather than directly between matter and matter. The momentum density of the electromagnetic field at each point in space is given by the cross product of the electric and magnetic fields (Poynting vector/c^2):\n\n(1/4pi c)(E x B)\n\nIntegrating the momentum density over space and taking the time derivative gives the total external force (i.e. force due to charged matter) on the electromagnetic field:\n\nF = dP_em/dt = d/dt &#92;integral (1/4pi c)(E(x) x B(x)) d^3x\n\nand there is an equal and opposite force -F (the Lorentz force) on matter due to the electromagnetic field.
252215
2nd Law of motion:  the net force = the time derivative of the momentum vector.
284269
I am sure someone cleverer will come along and shoot holes in this but I think this has a lot to do with Newton's 3 Laws (Newton being a clever dead bloke).\n\nForce: When you kick your sister in the shin you are using force\nMass: If she is fat, she has lots of mass\nInertia: Being fat, she will not be able to chase you. She has inertia. \n( Example from - http://www.allworldknowledge.com/newton/index.html)\n\nSo you are on the train and you are moving - its worth remembering that gravity (the force which keeps you on the floor) only goes downward not along. You on the train are moving along and the 'force' of the train going along, keeps you going along. Get it?\n\nWell you're still going along, watching the world go by, and then you jump.\n\nBy jumping you're still going along with the direction of the train thats one force. But when you start coming down it's the gravity pulling you back, as another force. The train moving you along hasn't changed, you just have two forces one pulling you down (the jump) and one pulling you along (the train).\n\nSo you end up in exactly the same place. With a few miserable commuters.
888499
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:
874216
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
1045430
Momentum - P = mv (P=momentum, m=mass, v = velocity)\nThree Laws of Newton - F = ma (F=Force; a=acceleration)\nEquations of motion - 1) v = u + at\n                                    2) S = (1/2)ut + at^2\n                                    3) v^2 = u^2 + 2aS\n(v=final velocity; u = initial velocity; S=distance)\n\nIf this can help you please mail me back !\nBEST OF LUCK !!!!