Application of Newton's LawsTYPES OF FORCERev. 0Page 17CP-04TYPES OF FORCEWhen determining how an object reacts to a force or forces, it is important tounderstand the different types of forces that may act on the object.EO 1.6DEFINE the following:a.Tensile forceb.Compressive forcec.Frictional forceEO 1.7EXPLAIN the difference between a static-friction force and akinetic-friction force.EO 1.8STATE two factors that affect the magnitude of the friction force.EO 1.9EXPLAIN the difference between centripetal force andcentrifugal force.The previous section discussed the equilibrium of forces as they act on bodies. Recalling thata force is defined as a vector quantity that tends to produce an acceleration of a body in thedirection of its application, it is apparent that the student must be acquainted with the varioustypes of forces that exist in order to construct a correct free-body diagram and apply theappropriate equation. A force is applied either by direct mechanical contact or by remote action.TensileandCompressiveForcesIn discussing the types of forces, a simple rule is used to determine if the force is a tensile or acompressive force. If an applied force on a member tends to pull the member apart, it is said tobe in tension. If a force tends to compress the member, it is in compression. It should also bementioned that ropes, cables, etc., that are attached to bodies can only support tensile loads, andtherefore such objects are in tension when placed on the free-body diagram. In addition, whena fluid is involved, it should be understood that fluid forces are almost always compressiveforces.FrictionAnother type of force often used in classical physics is the force resulting from two surfaces incontact, where one of the surfaces is attempting to move parallel to or over the other surface.Such forces are referred to as friction forces. There are two types of friction forces: those dueto dry friction, sometimes called Coulomb friction, and those resulting from fluid friction.
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