# AFOQT mech

 Force something that can change the velocity of an object friction alway acts in the opposite reaction as to retard relative motion sliding friction when two objects are in close contact spring scale measures friction newton is a unti of force which is 4.45N=1lb equilibruim when an object is at equilibrium all forces acting on it are equal to zero friction coefficient depends more on the pressure between two surfaces rather than velocity viscious drag when a solid mass passes thru a liquid, gas or air vicous drag will occur. Viscous drag will increase as speed increases.  - aerodynamic shapes come in to play-properties of the fluid also come into play Weight weight is equal to MG; mass x gravity elastic recoil when you applhy pressure on a solid object, that object will bend but also push back with a force equal to one exerted on it. tension tension can be measured by cutting a rope and introducing a spring scale buoyancy buoyancy acts in an upward direction on anything submerged in a liquid or gas. Sinking An object with a weight greater than the booyancy of the fluid it is in will sink. forces forces exist only in pairs there are six simple machines these are 1. lever2. incline plane3. pulley4. wedge5. wheel and axle6. screw Work work is the force applied over a distance Mechanical Advantage Output ratio to inout ratio of work produced by a machine Work  whenever a force moves something over a distance. W=FxD Newton Force required to move 1 kilogram one meter in one second. 1kg x m/s Mecahnical Advantage Formula MA = Fl/Fe = load/effort TCos theta the force that actually produces horizontal movement when a force is appled at an angle. Machine Efficiency ME= Wout/Win = work put out / work put in Vector a Force with both magnitude and direction Lever FeDe = FlDl  MA= Fl/DlMA = Re/Rl Lever types there are 3 types. class 1- fulcrum between effort and load; dolly class 2- Fulcrum on one end, with load between; wheel barrow, nutcracker class 3- Effort in the middle of load and fulcrum; fisherman, tongs Incline Plane plane set at and angle MA = lenght / height Woutput = load x heightWin= Force x lenght of ramp Wedge A double inclined plane that moves to exert a force along the lenght of its sides to push two objects apart -knife, ax, chisel Wheel and Axle wheel and axle Screw can be thought of as an inclined plane with a wedge wrapped around a cylinder.  forces are applied perpendicular to the groove Pulley the pulley uses the principle of applying force over a longer distance. It also uses tension in the rope or cable.  MA of Pulley De = Dl x supporting strands E = Load / number of strands W = F x D Hydraulic Jacks liquids are nearly incompressible.  MA = Al / Ae Aii / Ai = Di / Dii  Aii = diameter of larger circleAi = smallerDi= Vertical distance of smallerDii=Larger one Gears MA = # of teeth in load gear / # of teeth in effort gear Power 1 ft-lb/s = 550 hp746 joules = 1 hp AuthorAnonymous ID166619 Card SetAFOQT mech Descriptionafoqt Updated2012-08-20T01:51:40Z Show Answers