#force  the physical influence that produces a change in a physical quantity; "force equals mass times acceleration"
  supertype:  #physical_phenomenon  a natural phenomenon involving the physics of matter and energy
  subtype:  #aerodynamic_force__aerodynamicforce  forces acting on airfoils in motion relative to the air (or other gaseous fluids)
     subtype:  #aerodynamic_lift__aerodynamiclift__lift  the component of the aerodynamic forces acting on an airfoil that opposes gravity
        subtype:  #ground_effect  apparent increase in aerodynamic lift experienced by an aircraft flying close to the ground
  subtype:  #chemical_attraction__affinity  the force attracting atoms to each other and binding them together in a molecule: "basic dyes have an affinity for wool and silk"
  subtype:  #attractive_force__attraction  the force by which one object attracts another
     subtype:  #affinity  (immunology) the attraction between an antigen and an antibody
     subtype:  #chemical_bond__bond  an electrical force linking atoms
        subtype:  #covalent_bond  a chemical bond that involves sharing a pair of electrons between atoms in a molecule
           subtype:  #coordinate_bond__dative_bond  a covalent bond in which both electrons are provided by one of the atoms
        subtype:  #cross-link__crosslink__crosslinkage  a side bond that links two adjacent chains of atoms in a complex molecule
        subtype:  #hydrogen_bond  a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond
        subtype:  #ionic_bond__ionicbond__electrovalent_bond__electrovalentbond__electrostatic_bond__electrostaticbond  a chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion
        subtype:  #metallic_bond  a chemical bond in which electrons are shared over many nuclei and electronic conduction occurs
        subtype:  #peptide_bond__peptidebond__peptide_linkage__peptidelinkage  the primary linkage of all protein structures; the chemical bond between the carboxyl groups and amino groups that unites a peptide
     subtype:  #gravity__gravitation__gravitational_attraction__gravitationalattraction__gravitational_force__gravitationalforce  the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface; "gravitation cannot be held responsible for people falling in love"--Albert Einstein
        subtype:  #solar_gravity__solargravity  the gravity of the sun; "solar gravity creates extreme pressures and temperatures"
     subtype:  #magnetism__magnetic_attraction__magnetic_force  attraction for iron; associated with electric currents as well as magnets; characterized by fields of force
        subtype:  #electromagnetism  magnetism produced by an electric current; "electromagnetism was discovered when it was observed that a copper wire carrying an electric current can magnetize pieces of iron or steel near it"
        subtype:  #antiferromagnetism  magnetic field creates parallel but opposing spins; varies with temperature
           subtype:  #ferrimagnetism  a phenomenon in ferrites where there can be incomplete cancellation of antiferromagnetic arranged spins giving a net magnetic moment
        subtype:  #diamagnetism  phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force; unlike iron they are slightly repelled by a magnet
        subtype:  #ferromagnetism  phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed
        subtype:  #paramagnetism  materials like aluminum or platinum become magnetized in a magnetic field but it disappears when the field is removed
     subtype:  #van_der_Waal's_forces  relatively weak attraction between neutral atoms and molecules arising from polarization induced in each particle by the presence of other particles
  subtype:  #repulsive_force__repulsiveforce__repulsion  the force by which bodies repel one another
  subtype:  #centrifugal_force__centrifugalforce  the outward force on a body moving in a curved path around another body
  subtype:  #centripetal_force__centripetalforce  the inward force on a body moving in a curved path around another body
  subtype:  #cohesion  (physics) the intermolecular force that holds together the molecules in a solid or liquid
  subtype:  #Coriolis_force  a force due to the earth's rotation; acts on a body in motion (airplane or projectile) in a rotating reference frame; in a rotating frame of reference Newton's second law of motion can be made to apply if in addition to the real forces acting on a body a Coriolis force and a centrifugal force are introduced
  subtype:  #impetus__impetu__drift__impulsion  a force that moves something along
  subtype:  #Lorentz_force  the force experienced by a point charge moving along a wire that is in a magnetic field; the force is at right angles to both the current and the magnetic field; "the Lorentz force can be used to suspend a current-carrying object between two magnets"
  subtype:  #moment.force  the moment of a couple is the product of its force and the distance between its opposing forces
     subtype:  #dipole_moment  the moment of a dipole
        subtype:  #electric_dipole_moment  the dipole moment in an electric dipole
        subtype:  #magnetic_dipole_moment  (physics) a current loop gives rise to a magnetic field characteristic of a magnetic dipole; "An orbiting electron in an atom will have a magnetic dipole moment"
  subtype:  #propulsion  a propelling force
     subtype:  #nuclear_propulsion__nuclearpropulsion  the use of a nuclear reactor either to produce electricity to power an engine (as in a nuclear submarine) or to directly heat a propellant (as in nuclear rockets)
     subtype:  #reaction_propulsion  propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum
        subtype:  #jet_propulsion__jetpropulsion  propulsion by means of the discharge of a jet of fluid toward the rear
        subtype:  #rocket_propulsion  reaction propulsion using stored oxygen for combustion; used where there is insufficient atmospheric oxygen
  subtype:  #pull.force  the force used in pulling; "the pull of the moon"; "the pull of the current"
  subtype:  #push.force__thrust  the force used in pushing; "the push of the water on the walls of the tank"; "the thrust of the jet engines"
  subtype:  #reaction.force  (mechanics) the equal and opposite force that is produced when any force is applied to a body; "every action has an equal and opposite reaction"
  subtype:  #stress  (physics) force that produces strain on a physical body
     subtype:  #tension.stress  (physics) a stress that produces an elongation of an elastic physical body; "the direction of maximum tension moves asymptotically toward the direction of the shear"
     subtype:  #breaking_point  the degree of tension or stress at which something breaks
  subtype:  #torsion__torque  a twisting force
     subtype:  #magnetic_moment__moment_of_a_magnet  the torque exerted on a magnet or dipole when it is placed in a magnetic field
  subtype:  #magnetomotive_force  the force that produces magnetic flux
  subtype:  #life_force__vital_force__vitalforce__vitality__elan_vital  (biology) a hypothetical force (not physical or chemical) once thought by Henri Bergson to cause the evolution and development of organisms

1 statement is about an indirect instance of #force (#electromagnetism): pm#graph1_on_electromagnetism
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