The centre of gravity is the point where the weight of an object is considered to be concentrated.
Machine is a set of elements or parts that work together and use energy ton perform a task and obtain a result. The machines have three components:
- Driver element: feeds energy to the machine.
- Driven element: receives the force produced in the machine.
- Converting and/or transmitting: transmits and/or converts the motion from the driver element to the driven element.
Mechanisms are devices that transmit and/or convert motion. We can divide mechanisms by their function into:
- Motion transmission mechanisms: In this type, the mechanism is fed energy from the driver element and simply transfers it to the driven element. Examples are pulleys, levers, etc.
- Motion conversion mechanisms: In this type, the mechanism converts the movement from the driver element into a movement that the driven element can use. Examples are cams, eccentric, etc.
A lever is a rigid bar that can pivot on a point of support called a fulcrum.
Pulleys 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 a belt that slots into the grooved rim of the wheels. Examples are washing machines, cassete tapes, etc.
A gear is a mechanism consisting of two wheels with teeth. Examples are toys, watches, etc.
No hay comentarios:
Publicar un comentario