Machines and mechanism

A stable structure : we say that a structure is stable when it remains in equilibrium even when a force is applied to it.

The centre of gravity: the centre of gravity is the point where the weight of an object is considered to be concentrated.

Machine: a machine a set of elements or parts that work together and use energy to perform a atask and obtain a result.

Main component of a machine: -Driver element
                                                    -Driven element
                                                    -Converting and/or transmitting element

Mechanism: they are devices that transmit and/or conver motion

Difference between motion transmission and motion conversion:

-Motion transmission is fed by energy from the driver element and simply transfers it to the driven element.

Example: sprocket systems

-Motion conversion converts the movement from the driver element into a movement that the driven element can use.

Example: slider system

Lever: it is a rigid that can pivot on a point of support called a fulcrum. It is used to lift load by applying force to a point on the bar. 

Pulley: it is an instrument used to lived heavy loads. They are wheels with a grooved rim.

Belt and pulley system: this system is made up of two pulley wheels by a belt that slots into the grooved rim of the wheels. 

Example: a bycicle

Gears: a gear is a mechanism consisting of two wheels with teeth. 

Example: a tape dispenser.