MECHANISMS - Coggle Diagram
Around us we can see many moving objects and mechanisms that produce that we can also call motion.
How do these objects move?The chain gear system of a bicycle, the gears of a clock or watch,the lever in a seesaw and the pulley in a well are some of the simpler mechanisms that can be found in many objects.
Transporting people from A to B
lifting and carrying objects.
entertaining the children
telling the time
The most important element in all of them is the driving force that initiates the movement.
The driving force can be a spring, an electric motor or our own muscles.
Mechanisms are devices that transmit and convert forces and motion from a driving force or input element to an output element.They allow us to carry out certain tasks more easily and more efficiently.
Classification of Mechanisms
Controlling and regulating motion
Rotary to linear
rotary to recipocrating.
Linear motion mechanisms
Mechanisms that transmit motion and force in a straight line from one point to another.
Lever:A lever is a rigid bar that is support by a fulcrum.F is the force or effort applied at one end of the bar.R is the resistance or load which acts at the others end of the bar.d is the distance from F to the fulcrum.r is the distance from R to the fulcrum.
Types of levers:These are classified on three types:Class 1,Class 2 and Class 3 based on their relative postion of the lever,the effort applied and the resistance.
Fixed pulley:A fixed pulley is a wheel that has a groove around it into which a rope,chain or belt fits.It rotates around an axle that is fixed to an inmobile surface.A fixed pulley is balanced when the effort F is equal to the resistnce of the load R: F = R.Pulleys are used to raise and lower loads easily becouse we use our own weight to counteract them.Uses:Well and gym equipent for example.
Movable pulley:A moveable pulley is a set of two pulleys,one is fixed while the other can move in a linear direction.A moveable pulley is balanced when it satisfies this equation.The effort requiered to move a load with a moveable pulley is half the effort needed to move the same load with a fixed pulley.
Compound pulley:This is a system of fixed and moveable pulleys,often called block and tackle.If we use more pulleys,the systems becomes more complex,but less effort is needed to move a load.Uses:Lifts,good lifts and cranes.
Rotary motion mechanisms.
These mechanisms transmit motion and effort in a circular way,from input to the output.They include friction drives,pulley systems, gears and worm gears.