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Application of Newton's Laws TYPES OF FORCE Rev. 0 Page 17 CP-04 TYPES OF FORCE When  determining  how  an object reacts to a force or forces, it is important to understand the different types of forces that may act on the object. EO 1.6 DEFINE the following: a. Tensile force b. Compressive force c. Frictional force EO 1.7 EXPLAIN the difference between a static-friction force and  a kinetic-friction force. EO 1.8 STATE two factors that affect the magnitude of the friction force. EO 1.9 EXPLAIN   the difference    between    centripetal force    and centrifugal force. The previous section discussed the equilibrium of forces as they act on bodies.  Recalling that a force is defined as a vector quantity that tends to produce an acceleration of a body in the direction of its application, it is apparent that the student must be acquainted with the various types  of  forces  that  exist  in  order  to  construct  a  correct  free-body  diagram  and  apply  the appropriate equation.  A force is applied either by direct mechanical contact or by remote action. Tensile and Compressive Forces In discussing the types of forces, a simple rule is used to determine if the force is a tensile or a compressive force.  If an applied force on a member tends to pull the member apart, it is said to be in tension.  If a force tends to compress the member, it is in compression.  It should also be mentioned that ropes, cables, etc., that are attached to bodies can only support tensile loads, and therefore such objects are in tension when placed on the free-body diagram.  In addition, when a fluid is involved, it should be understood that fluid forces are almost always compressive forces. Friction Another type of force often used in classical physics is the force resulting from two surfaces in contact, 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 due to dry friction, sometimes called Coulomb friction, and those resulting from fluid friction.


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