Jeremy Scott Wings 2.0

The doc document may at the WAP end of browsing experience poor.Suggest that you first select the TXT, or download the source files to this machine view.Six scientific conceptThe first unit "tools and machinery machinery" refers to the use of mechanics principle consisting of a variety of device.Lever, pulley, inclined su***ce are mechanical.Simple machines was people used to call tool.And some mechanical force, some machines could be saving but can play other roles.Different machines with different structures and different function.And solve practical problems in life need to choose the appropriate tools and machinery.1-1 "tools" machinery refers to the use of mechanics principle consisting of a variety of device.Lever, pulley, inclined su***ce are mechanical.Simple machines was people used to call tool.Machinery is can make us labor saving and convenient device.Screwdriver, hammer, scissors and the mechanical structure is simple, also called http://www.porschedesignbounces2.com/ simple machine.1-2 "lever", science three: force lever pivot point, and resistance.(holds the lever, the lever can rotate around the pivot position; on the lever force position harder; lever overcome position called resistance.) some leverage to labor, some lever effort, some lever effort is not easy.Laborsaving lever fulcrum: forced point far from the fulcrum, resistance in.Such as: side cutting pliers, garden scissors, pliers, walnut clamp lever fulcrum effort: forced point near, far from the fulcrum of resistance.Such as: tweezers, chopsticks, tongs, barber scissors, saving is not easy: from the fulcrum of the lever at a distance equal to the distance from the fulcrum resistance.Such as: balance, 1-3 "seesaw lever tool in the study of" lever can be divided into the power-saving lever, strenuous lever, not saving effortless lever.A strenuous lever is not labor but can save power moving distance.1-4 "wheel" in secret axle wheel force capable of saving, the bigger the labor-saving wheel.(in the axis force, laborious.)Such as tap, the wheel and axle is fixed together with the rotating mechanism, called the wheel.The door handle, steering wheel, screwdriver, wrench are axle.1-5 "fixed pulleys and movable pulleys", a fixed pulley is fixed in one place, not with the weight and moves.Like a flagpole top pulley, a movable pulley is fixed, with the weight and moves.Like a crane hook can move together with heavy pulley, a fixed pulley and a movable pulley's role is not the same.Fixed pulley: not saving but can change the direction of a force can be movable pulley: labor but cannot change the direction of a force 1-6 "block"1 fixed pulleys and movable pulleys are combined together to form a pulley, pulley group can change the direction of a force, but also greatly saving.1-7 "cant role" Jeremy Scott Wings like ride in the car on the Jeremy Scott Wings 2.0 plank that simple mechanical called inclined plane, inclined Jeremy Scott Wings 2.0 plane can save labor.The road into a "S" shape is the use of the inclined plane labor-saving principle, screws and inclined plane.1-8 "bicycle" simple machinery, bicycle use wheel, bevel, simple mechanical lever principle, is widely used in transportation.Parts of a bicycle handle brake pedal bell simple mechanical type axle lever