TEMA 5

1.0 WHAT IS A MECHANISM?
The moving parts of a bicycle are examples of everyday mechanisms that make life easier and more enjoyable:

• The chain of a bicycle transfers motion to the back wheel
• The bar of a seesaw forms a lever that we can use for fun
• The gears inside old-fashioned clocks let us measure time
• The pulley systems above a well helps us to bring up later

They make work easier because they transmit and transform force and motion.All of these mechanims require an input force and motion from some type of source.In the case of a bicycle,our leg muscles are the input source.Mechanims transmit motion and force to receptors that finally perform the work.This is the output force nd motion.In the case of an analogue clock,the output receptors are the hands of the clock that move in circles to show the time.

1.1 THE PARTS OF A MECHANISM:

Mechanisms transmit and transform force and motion from an input source to an output receptor.This transmission and transformation lets us perform different types of work with more comfort and less effort.

Imput of force and motion.-----Mechanisms------Output force and motion.