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  2. Given Newton's third law, why are things capable of moving?

    physics.stackexchange.com/questions/45653

    However, to argue with Newton's 3rd law, you must consider the whole system. It states that the internal forces of your system cancel each other. By exerting a force on the box, you push yourself against the floor, i.e., ultimately against the earth. Hence, the oppositive force applies to you and the earth as a single system.

  3. Is Newton's third law always correct? - Physics Stack Exchange

    physics.stackexchange.com/questions/114669

    "Newton used the third law to derive the law of conservation of momentum;[33] from a deeper perspective, however, conservation of momentum is the more fundamental idea (derived via Noether's theorem from Galilean invariance), and holds in cases where Newton's third law appears to fail, for instance when force fields as well as particles carry ...

  4. Proof of Newton's Third Law - Physics Stack Exchange

    physics.stackexchange.com/questions/664772/proof-of-newtons-third-law

    Certainly Newton's law of gravitation is "proved" by taking a limiting case of Einstein's field equations. Planck's radiation law is a "derived" law, taking several more fundamental postulates as input. On some level, yes, laws cannot be "proven". But in my opinion it depends the depth of such a law and its range of validity.

  5. Why does Newton's Third Law actually work? - Physics Stack...

    physics.stackexchange.com/questions/348514

    Newton's third law is a restatement of conservation of momentum or perhaps a direct consequence of the law of conservation of momentum. We can understand it mathematically quite easily. The mathematical description given in this post is not rigorous but is sufficient to give the intuition required to understand the relationship.

  6. Why is Newton's third law known as *weak law of action and...

    physics.stackexchange.com/questions/205324/why-is-newtons-third-law-known-as...

    Why is Newton's third law known as weak law of action and reaction? Is the strong law of action and reaction not Newton's third law? But while working with central forces we apply Newton's third law (which is known as weak law) and not specifically strong law of action and reaction. At least I never heard people saying like "from the strong law ...

  7. When does not Newton's 3rd law apply? - Physics Stack Exchange

    physics.stackexchange.com/questions/35302/when-does-not-newtons-3rd-law-apply

    It should be noted that Newton's third law implies action at a distance. In other words, if the force that object exerts on object suddenly changes then Newton's third law demands that there must be an immediate change in the force that object exerts on object . Moreover, this must be true irrespective of the distance between the two objects.

  8. How did Newton discover his third law of motion?

    physics.stackexchange.com/questions/82359

    3rd law is Huygens', considering that; 1st law is Galileo's and; 2nd is Leibniz/Coriolis' gravity's inverse square law is Hooke's (universally acknowledged, even Newton's agiographers, p.152 affirm Hooke's paternity), and that; calculus is probably Leibniz', one of the greatest urban myth would get a serious blow. Is physics prepared to accept ...

  9. Understanding Newton's Third Law: The Case of Box Pushing

    www.physicsforums.com/threads/understanding-newtons-third-law-the-case-of-box...

    The mass of the box does not directly affect Newton's Third Law. However, the mass of the box can affect the acceleration of the box when pushed, as described by Newton's Second Law (F=ma). Is Newton's Third Law only applicable to pushing objects? No, Newton's Third Law applies to any type of interaction between two objects, including pushing ...

  10. Newton's 3rd Law and a bouncing ball - Physics Stack Exchange

    physics.stackexchange.com/questions/609174/newtons-3rd-law-and-a-bouncing-ball

    Second, Newton's 3rd Law (N3L) is always in effect; the ball is pulling on the Earth while the ball falls. If the ball (which has a constant force when it hits the ground (X)) experiences the same constant force in the opposite direction (−X, minus indicating opposite direction), then the total force acting on the ball should be net ZERO ( X+ ...

  11. How are unbalanced forces even possible, given Newton's 3rd law?

    physics.stackexchange.com/questions/225056

    Newton's third law and the phrase "unbalanced forces" need context. The third law states the following: Whenever object A exerts a force on object B, object B exerts an equal and opposite force on object A. Notice that there are two different objects here, and each force is applied on a different one.