Presentation on theme: "All mechanisms have some things in common: They involve some kind of motion. They involve some kind of force. They make a job easier to do. They."— Presentation transcript:
All mechanisms have some things in common: They involve some kind of motion. They involve some kind of force. They make a job easier to do. They need some kind of input to make them work. They produce some kind of output The Mechanisms
It´s probably the first machine to be used by humans. It´s a simple machine, because you only need a stick (bar, rigid beam) The Levers
The Lever is a bar with 3 components: LOADFULCRUMEFFORT The Levers
There are three types of levers. See what element is in the middle: effort, fulcrum or load. Class 1. The fulcrum is in the middle Class 2. The load is in the middle Class 3. The effort is in the middle The Levers. Types of levers
Archimedes’ Law of the Lever The Levers. Law of the Lever W1 is the value of effort. d1 is the distance between effort and fulcrum. W2 is the value of load. d2 is the distance between load and fulcrum. Law of the Lever
Archimedes of Syracuse (c. 287 BC – c. 212 BC) “Give me a place to stand on, and I will move the earth.” The Levers
There are 2 kinds of pulley: No mechanical advantage: single pulley With mechanical advantage: system pulley
The Single Pulley Effort Load pulley rope To make the job of lifting large weights easier. You can’t lift more weight than your own weight. (Limit, Maximun)
The System Pulley To make the job of lifting large weights easier. The effort is less than the charge: this is the mechanical advantage. Advantage 2:1 Advantage 4:1
The basic kinds of motion. Rotary, going round and round
Oscillating, swinging backwards and forwards The basic kinds of motion.
Linear, in a straight line The basic kinds of motion.
Reciprocating, backwards and forwards, in a straight line The basic kinds of motion. Return