How do machines work
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This document discusses different types of machines and how they work. It explains that cars, planes, and lorries work with petrol as their energy source, while torches, TVs, and fridges work using electricity. Lemon squeezers, staplers, and screwdrivers are also presented as machines that operate through human energy rather than another external power source. Examples of each type of machine are shown through pictures.
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The document discusses different types of machines, categorizing them as either simple or complex. Simple machines like spades, scissors, and hammers are made of few pieces and use only human energy to operate. More technically advanced machines such as cars, dishwashers, radios, and computers are considered complex as they are made up of many interconnected parts and require electricity or petrol in addition to human energy to function. Complex machines are comprised of multiple components while simple machines have fewer elements and are powered solely by human force.
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Where do materials come from
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Plants help us
Plants provide humans with many useful things like food, materials, and perfume. Flowers are used to make perfume while wood is used to create furniture and cotton is used for clothing. Plants have different parts like roots, stems, leaves, flowers, and fruits that are all used by humans.
Wild plants and crops
This document discusses wild plants and crops. It explains that daisies, lavender, and dandelions are examples of wild plants that grow without care in many places. In contrast, wheat, sunflowers, and broccoli are crops that farmers plant, water, and harvest for food. Farmers grow crops by planting seeds and looking after the plants.
Fruits and seeds
This document discusses different fruits and their seeds. It introduces watermelon, apple, peach, and plum, stating that each is a fruit that contains seeds, with watermelon and apple having many seeds while peach and plum each have a single seed. The teacher, Javier Robles, presents information on fruits and seeds as part of a plant unit for students.
Trees
Trees are plants that have a very big stem called a trunk that supports branches and leaves. They grow taller than other plants and have wood that provides structure and transport for water and nutrients. Trees come in many different shapes, sizes and types and are an important part of ecosystems.
Parts of a plant
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Plants are living things
Plants are living things that need soil, water, air, and sunlight to survive. Without these key requirements, plants cannot grow from seeds, develop through various stages, reproduce by creating more seeds, or complete their life cycle. The document outlines the basic needs of plants and the natural life process they undergo from birth to death.
Amphibians
Amphibians have bare skin, lay eggs, and are born from eggs. They are oviparous and live in water. Examples given are toads, salamanders, and frogs, which are all classified as amphibians.
Reptiles
This document discusses reptiles as a category of animals. It notes that reptiles have scales, lay eggs, and are born from eggs. Examples of reptiles provided include iguanas, snakes, lizards, tortoises, and turtles, all of which have scales and reproduce by laying eggs.
Fishes
Fishes have scales and fins, live in water, lay eggs from which they hatch, and are oviparous. Examples given include salmon, which are fishes, as well as dolphins and sharks, which are incorrectly stated to be fishes.
Birds
Birds are animals that have feathers, two legs, and two wings. They are born from eggs and eat worms and insects. Most birds can fly, and examples of birds include owls, hens, eagles, and penguins.
Mammals
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Wild and domestic animals
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Where animals live
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How do machines work
- 1. UNIT 8: MACHINES How do machines work? TEACHER: JAVIER ROBLES
- 2. Cars work with petrol This is a car
- 3. Planes work with petrol This is a plane
- 4. Lorries work with petrol This is a lorry
- 5. Torches work with electricity This is a torch
- 6. TV´s work with electricity This is a television
- 7. Fridges work with electricity This is a fridge
- 8. Lemon squezeers work with human energy This is a lemon squeezer
- 9. Staplers work with human energy This is a stapler
- 10. Screwdrivers work with human energy This is a screwdriver