Machines, alejandro u.
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A machine is something that makes work easier by using simple or complex machines. There are six simple machines: the pulley, inclined plane, screw, wheel, wedge, and lever. Complex machines are made up of combinations of simple machines and require an energy source like people, electricity, or fuel. Examples of complex machines are washing machines, cars, buses, and robots used in manufacturing. A bicycle is also a complex machine that uses levers, pulleys, and gears powered by human kinetic energy.
Machines, alejandro u.
- 2. • A machine is something we use to make work easier. We can classify machines as simple machines or complex machines • Simple Machines: Have few or no moving parts. Pliers
- 3. • There are six simple machines: • 1) A pulley, uses a whell and a rope to lift or lower an object. • 2) An inclined plane, move objects up or down.
- 4. • 3) A Srew, is a hold things together or lift objects • 4) A Wheel, turn around an axle. We use it to lift or move objects
- 5. • 5) A Wedge, we use a wedge to cut objects. • 6) A Lever is a rigid bar with fulcrum. We use it to lift or move objects.
- 6. • Complex Machines are made up of a number of simple machines working together. • Complex machines need energy. This energy can come from people, electricity or fuel. We use complex machines every day,complex machines are everywhere.
- 7. • Electrical appliances: Some examples are: Washing machines, cookers and calculators in our schools. • Which energy do they use? They use electrical energy. And some electrical use energy from batteries. • Forms of transport: Some examples are: Buses, cars, lorries and bicycles. • Wich energy do they use? • They use the fuel energy, but bike uses people energy. Some are electrical energy.
- 8. • Robot at work: • What do we use them for? • They use robots to make mass-produced products, and they do jobs dangerous for people. • What are the advantages of robots? • The advantages are that are more efficient and safer to use.
- 9. • A bicycle is a complex machine because it´s made up of some simple machines working together. It needs kinetic energy. – 1) Handlebars. They are levers that help us change direction. – 2) Pedals. They are levers. They make the wheels turn around when we push them with our feet. – 3) Gears. They are pulleys that help us when we have to go up or down a hill. – 4) Gear Controls. They are levers in the handlebars that are connected to the gears through cables. – 5) Brakes. They are levers that help us slow or stop the bike. They are in the wheel. – 6) Brakes Levers. They are in the handlebars and are connected to the brakes through cables.
- 10. THE BICYCLE
- 11. • 1.- The first bicycles were made of wood. They had no pedals and used their feet to walk at the same time. • 2.- A bicycle with pedals was invented. This bicycle had metal tyres. • 3.- A bicycle with a very big front wheel was invented. Its tyres were made of solid rubber. • 4.- Both wheels were the same size, but wheels were still made of solid rubber. • 5.- The first bicycle with air in its tyres was invented