4th post

When a structure is stable?
we say that a structure is stable when it remains in equilibrium even when a force is applied to it

What is the centre of gravity?
the centre of gravity is thge point where the weight of an object is considered to be concentrated 

Machine
we use the word machine to describe a set of elements or parts that work together and use energy to perform a task and obtain a result.

Machine have 3 components:

Driver elements: feeds energy to the machine 

Driven element: receives the force produced in the machine

Converting and/or transmitting element: transmits and/or converts the motion from the driver element to the driven element .

Mechanisms
devices that transmit and/or convert motion are called mechanisms

Motion transmission mechanisms is fed energy from the driver element and simply transfers it to driven element 

Example : lever

Motion converssion mechanisms coverts tyhe movement of the driver element into a movement that the driven element can use

Example : cams

Lever
is a rigid bar that can pivot on a point support called a fulcrum

Puleys

Puleys are used to lift heavy loads.They are wheels with a grooved rim.

Belt and pulley system

This system is made up of two pulley wheels joined by abelt that solts into the grooved rim of the wheel.

Ex: 

Gears

A gear is a mechanism consisting of two wheels with teeth.

Ex : 


Taging Machine