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  2. Coercion - Wikipedia

    en.wikipedia.org/wiki/Coercion

    Coercion involves compelling a party to act in an involuntary manner by the use of threats, including threats to use force against that party. [1] [2] [need quotation to verify] [3] It involves a set of forceful actions which violate the free will of an individual in order to induce a desired response.

  3. Reaction (physics) - Wikipedia

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

    A possible cause of this problem is that the third law is often stated in an abbreviated form: For every action there is an equal and opposite reaction, [8] without the details, namely that these forces act on two different objects. Moreover, there is a causal connection between the weight of something and the normal force: if an object had no ...

  4. Force - Wikipedia

    en.wikipedia.org/wiki/Force

    For so-called "Stokes' drag" the force is approximately proportional to the velocity, but opposite in direction: =, where: b {\displaystyle b} is a constant that depends on the properties of the fluid and the dimensions of the object (usually the cross-sectional area ), and

  5. Normal force - Wikipedia

    en.wikipedia.org/wiki/Normal_force

    Figure 2: Weight (W), the frictional force (F r), and the normal force (F n) acting on a block.Weight is the product of mass (m) and the acceleration of gravity (g).In the case of an object resting upon a flat table (unlike on an incline as in Figures 1 and 2), the normal force on the object is equal but in opposite direction to the gravitational force applied on the object (or the weight of ...

  6. Force between magnets - Wikipedia

    en.wikipedia.org/wiki/Force_between_magnets

    In the magnetic pole model, the magnetic dipole moment is due to two equal and opposite magnetic charges that are separated by a distance, d. In this model, m is similar to the electric dipole moment p due to electrical charges: =, where q m is the ‘magnetic charge’. The direction of the magnetic dipole moment points from the negative south ...

  7. Coriolis force - Wikipedia

    en.wikipedia.org/wiki/Coriolis_force

    Kinematics insists that a force (pushing to the right of the instantaneous direction of travel for a counter-clockwise rotation) must be present to cause this curvature, so the rotating observer is forced to invoke a combination of centrifugal and Coriolis forces to provide the net force required to cause the curved trajectory. [citation needed]

  8. Couple (mechanics) - Wikipedia

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

    The simplest kind of couple consists of two equal and opposite forces whose lines of action do not coincide. This is called a "simple couple". [1] The forces have a turning effect or moment called a torque about an axis which is normal (perpendicular) to the plane of the forces. The SI unit for the torque of the couple is newton metre.

  9. Oscillation - Wikipedia

    en.wikipedia.org/wiki/Oscillation

    An undamped spring–mass system is an oscillatory system. Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.