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  2. Newton's laws of motion - Wikipedia

    en.wikipedia.org/wiki/Newton's_laws_of_motion

    The forces acting on a body add as vectors, and so the total force on a body depends upon both the magnitudes and the directions of the individual forces. [23]: 58 When the net force on a body is equal to zero, then by Newton's second law, the body does not accelerate, and it is said to be in mechanical equilibrium.

  3. Charge conservation - Wikipedia

    en.wikipedia.org/wiki/Charge_conservation

    In physics, charge conservation is the principle, of experimental nature, that the total electric charge in an isolated system never changes. [1] The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved.

  4. Net force - Wikipedia

    en.wikipedia.org/wiki/Net_force

    That force is the net force. [1] When forces act upon an object, they change its acceleration. The net force is the combined effect of all the forces on the object's acceleration, as described by Newton's second law of motion. When the net force is applied at a specific point on an object, the associated torque can be calculated.

  5. Conservation law - Wikipedia

    en.wikipedia.org/wiki/Conservation_law

    These quantities are conserved in certain classes of physics processes, but not in all. A local conservation law is usually expressed mathematically as a continuity equation, a partial differential equation which gives a relation between the amount of the quantity and the "transport" of that quantity. It states that the amount of the conserved ...

  6. Virial theorem - Wikipedia

    en.wikipedia.org/wiki/Virial_theorem

    Assuming that the masses are constant, G is one-half the time derivative of this moment of inertia: = = = = = = =. In turn, the time derivative of G is = = + = = = + = = + =, where m k is the mass of the k th particle, F k = ⁠ dp k / dt ⁠ is the net force on that particle, and T is the total kinetic energy of the system according to the v k ...

  7. Electric charge - Wikipedia

    en.wikipedia.org/wiki/Electric_charge

    The total electric charge of an isolated system remains constant regardless of changes within the system itself. This law is inherent to all processes known to physics and can be derived in a local form from gauge invariance of the wave function. The conservation of charge results in the charge-current continuity equation.

  8. How to calculate interest on a loan: Tools to make it easy

    www.aol.com/finance/calculate-interest-loan...

    You can calculate your total interest by using this formula: Principal loan amount x Interest rate x Loan term in years = Interest. For example, if you take out a five-year loan for $20,000 and ...

  9. Couple (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Couple_(mechanics)

    In physics, a couple is a system of forces with a resultant (a.k.a. net or sum) moment of force but no resultant force. [1]A more descriptive term is force couple or pure moment.