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A free body diagram of a block resting on a rough inclined plane, with its weight (W), normal reaction (N) and friction (F) shown.. In mechanics, the net force is the sum of all the forces acting on an object.
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For example, a free body diagram of a block sitting upon an inclined plane can illustrate the combination of gravitational force, "normal" force, friction, and string tension. [ note 4 ] Newton's second law is sometimes presented as a definition of force, i.e., a force is that which exists when an inertial observer sees a body accelerating.
In classical mechanics, for a body with constant mass, the (vector) acceleration of the body's center of mass is proportional to the net force vector (i.e. sum of all forces) acting on it (Newton's second law): = =, where F is the net force acting on the body, m is the mass of the body, and a is the center-of-mass acceleration.
Tom Clancy's Net Force is a novel series, created by Tom Clancy and Steve Pieczenik and originally written by Steve Perry. The original series ceased publication in 2006. There was also a spin-off of young adult books called Net Force Explorers. The series was rebooted in 2019 with the Dark Web novel by Jerome Preisler.
The lift force is transmitted through the pressure, which acts perpendicular to the surface of the airfoil. Thus, the net force manifests itself as pressure differences. The direction of the net force implies that the average pressure on the upper surface of the airfoil is lower than the average pressure on the underside. [60]
The exchange particle that mediates this force is the gluon. Electromagnetic interaction: the familiar interaction that acts on electrically charged particles. The photon is the exchange particle for this force. Weak interaction: a short-range interaction responsible for some forms of radioactivity, that acts on electrons, neutrinos, and quarks.
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