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## Force

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**What is Force?**• It is measured in the SI unit of newtons and represented by the symbol F. • a force is any influence that causes an objectto undergo a certain change, either concerning its movement, direction, or geometrical construction. • Formula: F=ma**Pre-Newtonian Concepts**• Aristotle famously described a force as anything that causes an object to undergo "unnatural motion. • Aristotle provided a philosophical discussion of the concept of a force as an integral part of Aristotelian cosmology.**Laws of Motion**• First Law of Motion • Newton's First Law of Motion states that objects continue to move in a state of constant velocity unless acted upon by an external net force or resultant force. • Second Law of Motion • A modern statement of Newton's Second Law is a vector differential equation. • Third Law of Motion • For every action there is an equal and opposite reaction.**Pre-Newtonian Concepts**• Galileo Galileiwas the first to point out the inherent contradictions contained in Aristotle's description of forces. • First described the Dynamic equilibrium.**What is Gravity?**• It is introduced by Isaac Newton. • Formula: F=mg • The force of gravity is opposed by the reactions of their supports.**Static equilibrium was understood well before the invention**of classical mechanics. The simplest case of static equilibrium occurs when two forces are equal in magnitude but opposite in direction. Equilibrium occurs when the resultant force acting on a point particle is zero (that is, the vector sum of all forces is zero).**The Electrostatic force was first described in 1784 by**Coulomb as a force which existed intrinsically between two charges.