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  2. Stokes' law - Wikipedia

    en.wikipedia.org/wiki/Stokes'_law

    In fluid dynamics, Stokes' law gives the frictional force – also called drag force – exerted on spherical objects moving at very small Reynolds numbers in a viscous fluid. [1] It was derived by George Gabriel Stokes in 1851 by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations. [2]

  3. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    If this frictional reaction force satisfies , then the tentative assumption was correct, and it is the actual frictional force. Otherwise, the friction force must be set equal to F f = μ N {\displaystyle F_{f}=\mu N} , and then the resulting force imbalance would then determine the acceleration associated with slipping.

  4. Free body diagram - Wikipedia

    en.wikipedia.org/wiki/Free_body_diagram

    Free body and kinetic diagrams of an inclined block. In dynamics a kinetic diagram is a pictorial device used in analyzing mechanics problems when there is determined to be a net force and/or moment acting on a body. They are related to and often used with free body diagrams, but depict only the net force and moment rather than all of the ...

  5. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence and environmental information? Inverse protein-folding problem: Is it possible to design a polypeptide sequence which will adopt a given structure under certain environmental conditions?

  6. Thermodynamic versus kinetic reaction control - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_versus...

    In such a case A is the kinetic product and is favoured under kinetic control and B is the thermodynamic product and is favoured under thermodynamic control. [ 1 ] [ 2 ] [ 3 ] The conditions of the reaction, such as temperature, pressure, or solvent, affect which reaction pathway may be favored: either the kinetically controlled or the ...

  7. Chemical kinetics - Wikipedia

    en.wikipedia.org/wiki/Chemical_kinetics

    The unknown part of the equation is y(x+Δx), which can be found if we have the data for the initial values. Runge-Kutta methods → it is more accurate than the Euler method. In this method, an initial condition is required: y = y 0 at x = x 0. The problem is to find the value of y when x = x 0 + h, where h is a given constant.

  8. Mechanical energy - Wikipedia

    en.wikipedia.org/wiki/Mechanical_energy

    The potential energy of an object can be defined as the object's ability to do work and is increased as the object is moved in the opposite direction of the direction of the force. [nb 1] [1] If F represents the conservative force and x the position, the potential energy of the force between the two positions x 1 and x 2 is defined as the ...

  9. Jerk (physics) - Wikipedia

    en.wikipedia.org/wiki/Jerk_(physics)

    The static friction force adapts to the residual spring force, establishing equilibrium with zero net force and zero velocity. Consider the example of a braking and decelerating car. The brake pads generate kinetic frictional forces and constant braking torques on the disks (or drums) of the wheels. Rotational velocity decreases linearly to ...

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