4TH POST

Machines and mecanism 

• When a structure is stable?

Is stable when it remains in equilibrium even when a force applied to it.

• What is the centre of gravity?

The  centre of gravity is the 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.

The principal components of a machine: 

 -Driver element

- Driven element

- Converting and/ or transmitting element

Mechanism:

Is device that transmit and/or convert motion.

The diferences between motion transmission and motion conversion:

-The motion transmission is when the mechanism is fed energy from the driver element and simply transfers it to the driven element

-The motion conversion is when the mechanism converts the movement from the driver element into a movement that the driven element can use.

What is a lever?

Is a lever is a rigid bar can pivot on a point of support called a fulcrum. It is used to lift load by appying force to a point on the bar.

  

What is a pulley?
Pulleys are used to lift heavy loads. They are wheels with a grooved rim.

Explain belt and pulley system:
This system is madre up of two pulley wheels joined by a belt that slots into the grooved rim of the wheels.Examples: washing machines, cassette types, fans...

Explain what gears are:
Is a mechanism consisting of two wheels with teeth. Example: You have two red gears that you want to keep synchronized, but they are some distance apart. You can place a big gear between them if you want them to have the same direction of rotation