Prehistoric Innovations: Wheels and Wheeled Vehicles
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Chapter 8 Glossary
Technology: Engineering Our World © 2012 Chapter 8: Machines—Glossary friction. A force that acts like a brake on moving objects. gear. A rotating wheel-like object with teeth around its rim used to transmit force to other gears with matching teeth. hydraulics. The study and technology of the characteristics of liquids at rest and in motion. inclined plane. A simple machine in the form of a sloping surface or ramp, used to move a load from one level to another. lever. A simple machine that consists of a bar and fulcrum (pivot point). Levers are used to increase force or decrease the effort needed to move a load. linkage. A system of levers used to transmit motion. lubrication. The application of a smooth or slippery substance between two objects to reduce friction. machine. A device that does some kind of work by changing or transmitting energy. mechanical advantage. In a simple machine, the ability to move a large resistance by applying a small effort. mechanism. A way of changing one kind of effort into another kind of effort. moment. The turning force acting on a lever; effort times the distance of the effort from the fulcrum. pneumatics. The study and technology of the characteristics of gases. power. The rate at which work is done or the rate at which energy is converted from one form to another or transferred from one place to another. pressure. The effort applied to a given area; effort divided by area. pulley. A simple machine in the form of a wheel with a groove around its rim to accept a rope, chain, or belt; it is used to lift heavy objects. -
Historical Development of the Wheel
HISTORICAL DEVELOPMENT OF THE WHEEL Next to controlled fire, the wheel was clearly early man’s most significant invention. It advanced transportation, manufacturing, and warfare significantly and to this day is present in multiple forms from rotary tools, electric generators, trains, automobiles and jet engines to cooling fans in electronic computers and drills used in dentistry. We want here to speculate on how the wheel and all its later refinements were probably invented. It is likely that there were multiple sources for this invention driven by local needs. Certainly pottery wheels and war chariots were in use in ancient Mesopotamia by 3000BC and pictures of wagons found on pottery in eastern Europe, dated via carbon dating , also indicate the early use of wheels in wagons at about the same time. It is our contention that the concept of the wheel predate these times by thousands of years. Here are our thoughts on the matter. Early man clearly would have been aware of the circular shape of the sun and the moon and the periodicity involved in the movement of celestial objects. Certainly Cro-Magnon man some twenty thousand years ago would also have noticed that certain spherically shaped rocks found along beaches have the interesting characteristic that they roll down inclines. Soon someone would have made a toy using such rocks by inserting an axle into the center of several of such stones. Before long someone else would have come along and recognized that such rolling toys would work even better by replacing the drilled spherical pebbles with round stone or wooden discs in the shape suggested by the full moon and sun as they appeared in the sky. -
For Creative Minds
For Creative Minds The For Creative Minds educational section may be photocopied or printed from our website by the owner of this book for educational, non-commercial uses. Cross-curricular teaching activities, interactive quizzes, and more are available online. Go to www.ArbordalePublishing.com and click on the book’s cover to explore all the links. Simple Machines Simple machines have been used for hundreds of years. There are six simple machines—the wedge, wheel and axle, lever, inclined plane, screw, and pulley. They have few or no moving parts and they make work easier. When you use simple machines, you use a force—a push or a pull—to make something move over a distance. There are six types of simple machines. Use the color coding to match the machine’s description to its picture. A lever is a stiff bar that turns on a fixed point called a fulcrum. When one side of the lever is pushed down, the other side of the lever lifts up. A lever helps to lift or move things. An inclined plane is a slanted surface that connects a lower level to a higher level. Objects can be pushed or pulled along the inclined plane to move them from a high place to a low place, or a low place to a high place. A pulley has a grooved wheel and rope to raise and lower a load. Pulling on the rope causes the wheel to turn and raise the object on the other end of the rope. A screw has an inclined plane (a thread) wrapped around a shaft. -
The Vernacular in Church Architecture
Le Corbusier’s pilgrimage chapel at Ronchamp, France. Photo: Groucho / CC BY-NC-ND 2.0 / https://www.flickr. com/photos/grou- cho/13556662883 LIVING STONES The Vernacular in Church Architecture Alexis Vinogradov 1 Gregory Dix, The The liturgy of the Early Christian era the heart of worship that is ultimately Shape of the Lit- was about doing rather than saying. to be expressed and enhanced by both urgy (Westminster: Dacre Press, 1945), This distinction is borrowed from Dom art and architecture. Of course this con- 12–15. Kiprian Kern, Gregory Dix by Fr. Kyprian Kern, who sideration must include literature, mu- Евхаристия (Paris: was responsible for the first major Or- sic, and ritual movement and gesture. YMCA-Press, 1947). thodox investigation of the sources 2 and practices of the Christian eccle- Our earliest archaeological discover- Marcel Jousse, L’An- 1 thropologie du geste sia. The Jesuit scholar Marcel Jousse ies substantiate the nature of the “do- (Paris: Gallimard, reinforces this assertion in writing of ing” performed by the Church. The 2008). the early Christian practice and un- celebrants did not initially constitute derstanding of “eating and drinking” a distinct caste, for all who were gath- the word, rooted in a mimesis of ges- ered were involved in the rites. One tures passed on through generations.2 can therefore understand the emer- “Do this in remembrance of me,” says gence throughout Christian history of Christ at the last gathering with his anti-clerical movements, which have disciples (Lk. 22:19). pushed back against the progressive exclusion of the faithful from areas The present essay is about the ver- deemed “sacred” in relation to the nacular in church architecture. -
Launch It! Lesson Overview Suggested Grade Levels
Launch It! Lesson Overview Students will investigate simple and compound machines. Suggested Grade Levels: 3-8 Standards for Lesson Content Standard A: Science as Inquiry Content Standard B: Physical Science VA SOL: 3.1 a, b, c; 3.2 a, b, c, d; 4.1 a, b; 5.1 e, f, h; 6.1 a, b, f, g, h, i; LS.1 a, b, e, f, i; PS.1 a, g, k, l, m; PS.10 d Time Needed This lesson can be completed in one class period. Materials for Lesson • 1-2 bags of jumbo marshmallows • Various objects that could be used as a lever such as ruler, plastic spoons, meter stick, paint stick, CD case • Small buckets or boxes to be used as a target for the marshmallows. Content Background Information for teacher: The simple machine lessens the effort needed to do the same amount of work, making it appear to be easier. The payoff is that we may have to exert less force over a greater distance. There are six basic or simple machines, which alone or in combination make up most of the machines and mechanical devices we use. These simple machines are the lever, the pulley, the wheel and axle, the incline, the wedge, and the screw. Compound machines are used to make work easier. A compound machine is made up of more than one type of simple machine. Common examples include scissors, shovel, wheelbarrow, pencil sharpener, and can opener. Simple and compound machines help us with our daily lives. Many of them are located at school, at home, and in our means of transportation. -
Instructional Terminology A
Instructional Terminology ENGINEERING 15.0000.00 Analyze – to examine of the elements or structure of something A AC Voltage - alternating current; an electric current that reverses Archimedes Principle - any object wholly or partly immersed in fluid direction will be buoyed up by a force equal to the weight of the fluid displaced by the object AC/DC - alternating current and direct current; an electric Architectural engineer - an engineer who specializes in the Acceleration – the rate of change of a velocity per unit of time structural, mechanical, and electrical construction of buildings (a=∆v/∆t) Area - a part of an object or surface Accuracy - the degree to which the result of a measurement, calculation, or specification conforms to the correct value or a Assembling – putting together individual parts to create a final standard; exactness product Aeronautical engineer – a person who designs machines that fly; Assembly – individual parts that fit together to create a final product also known as Aerospace engineer Assessment – an evaluation technique Aerospace engineer —a person who designs machines that fly Atomic – relating to an atom, the smallest particle of a chemical Alloy – a mixture of metals element Alternating Current – electric current that reverses direction Atomic engineering – the branch of engineering concerned with the application of the breakdown of atoms as well as the fusion of atomic Alternative - available as another possibility nuclei or other subatomic physics; also known as nuclear engineering Ampere (AMP) – a -
Simple Machines Study Guide SOL 3.2
Simple Machines Study Guide SOL 3.2 Energy *Ability to do work is energy. *Use simple machines to make our work easier . Force *Force is the push or pull that is placed on an object. *We measure force in Newtons . *When you push or pull something, you apply a force to it. Friction *Friction is a rubbing force. *Friction slows all things to a stop . Example: A ball will roll with LESS friction on hard surface than on grass. Gravity *Gravity attracts two objects together. *Gravity pulls objects to the ground. Load *A load is the object being pushed or lifted. load There are six different simple machines that help us do work easier. Inclined Plane *An inclined plane is a sloping surface. *This tool helps in pushing or pulling a load. *It helps move things up and down easier. Wedge *A wedge is two inclined planes with bases together. *This tool helps us push or move things apart. *It is used for cutting and splitting. Screw *A screw is an inclined plane that moves around and around as it moved forward, upward, or downward. *This tool help us hold things together. *A jar lid is also a screw! Lever *A lever is a stick or bar that has three parts. *fulcrum *load load *effort fulcrum force *This tool helps you lift heavy loads. Wheel and Axle *A wheel and axle is a wheel with a bar through it. *This tool helps move people and things. *It makes moving things easier. Pulley *A pulley is a wheel with a rope over it. -
The History of the Wheel and Bicycles
NOW & THE FUTURE THE HISTORY OF THE WHEEL AND BICYCLES COMPILED BY HOWIE BAUM OUT OF THE 3 BEST INVENTIONS IN HISTORY, ONE OF THEM IS THE WHEEL !! Evidence indicates the wheel was created to serve as potter's wheels around 4300 – 4000 BCE in Mesopotamia. This was 300 years before they were used for chariots. (Jim Vecchi / Corbis) METHODS TO MOVE HEAVY OBJECTS BEFORE THE WHEEL WAS INVENTED Heavy objects could be moved easier if something round, like a log was placed under it and the object rolled over it. The Sledge Logs or sticks were placed under an object and used to drag the heavy object, like a sled and a wedge put together. Log Roller Later, humans thought to use the round logs and a sledge together. Humans used several logs or rollers in a row, dragging the sledge over one roller to the next. Inventing a Primitive Axle With time, the sledges started to wear grooves into the rollers and humans noticed that the grooved rollers actually worked better, carrying the object further. The log roller was becoming a wheel, humans cut away the wood between the two inner grooves to create what is called an axle. THE ANCIENT GREEKS INVENTED WESTERN PHILOSOPHY…AND THE WHEELBARROW CHINA FOLLOWED 400 YEARS AFTERWARDS The wheelbarrow first appeared in Greece, between the 6th and 4th centuries BCE. It was found in China 400 years later and then ended up in medieval Europe. Although wheelbarrows were expensive to purchase, they could pay for themselves in just 3 or 4 days in terms of labor savings. -
A Machine with Few Or No Moving Parts. Simple Machines Make Work Easier
Simple Machine: A machine with few or no moving parts. Simple machines make work easier. http://www.youtube.com/watch?v=grWIC9VsFY4 Pulley 1.There are six simple machines. They make it easier for us to do work. A wheel pulley is one of the six simple machines. A pulley is a wheel with a rope wrapped around it. The wheel has a groove around the edge to hold the rope in place. You can attach one end of the rope to a heavy object that you want to lift. You will pull on the other end of the rope to lift the heavy object. Pulleys make work easier by changing the direction of the force needed to do work. It is hard to lift a heavy object up into the air. It is easier to pull the same object down to the ground. This is because of the force of gravity. Gravity is the force that pulls objects down to the Earth. Gravity helps to make work easier when you use a pulley. You can also use more than one pulley at a time to make the work even easier. The weight will feel lighter with each pulley that you use. If you use two pulleys, it will feel like you are pulling one-half as much weight. If you use four pulleys, it will feel like you are pulling one-fourth as much weight! The weight will be easy to move, but you will have more rope to pull with each pulley that you add. You will pull twice as much rope with two pulleys. -
Simple Machines
Delta Science Reader SSimpleimple MachinesMachines Delta Science Readers are nonfiction student books that provide science background and support the experiences of hands-on activities. Every Delta Science Reader has three main sections: Think About . , People in Science, and Did You Know? Be sure to preview the reader Overview Chart on page 4, the reader itself, and the teaching suggestions on the following pages. This information will help you determine how to plan your schedule for reader selections and activity sessions. Reading for information is a key literacy skill. Use the following ideas as appropriate for your teaching style and the needs of your students. The After Reading section includes an assessment and writing links. VERVIEW Students will O discover the forces that make things move The Delta Science Reader Simple Machines and stop moving introduces students to the world of simple understand how work and energy are machines and the energy that makes them related and learn the formula for work. Students explore the six simple calculating work machines—the inclined plane, the lever, the wheel and axle, the pulley, the wedge, and identify the six simple machines and how the screw—and read about the difference they work between simple and compound machines. examine nonfiction text elements such The book also presents biographical as table of contents, headings, lists, and sketches of two key scientists in this field— glossary Archimedes, an ancient Greek mathematician, and Lillian Gilbreth, a twentieth-century extend their reading by writing about the inventor. Students also investigate the levers ways that simple machines affect their lives in the human body and find out how a roller interpret photographs and diagrams to coaster works. -
Identifying Simple Machines
Name: _______________________________________ Simple Machines The six types of simple machines are: • inclined plane • lever • wedge • pulley • screw • wheel and axle 1. An ax is used to chop wood. The metal part chops through the wood, pushing it apart into two smaller sections. Which simple machine is found on the head of this ax? ______________________________ 2. The center of this seesaw is used to balance the board with the seats. The children can easily move up and down without much force. The seesaw is an example of which simple machine? ______________________________ 3. The cap on this water bottle has a spiral shape. When you place it on the bottle and twist, the cap pulls itself toward the bottle. The bottle cap is an example of which simple machine? ______________________________ Super Teacher Worksheets - www.superteacherworksheets.com 4. When you turn the large knob on a door, a rod on the inside releases a latch that holds the door closed. It would be difficult to turn the rod, if the knob wasn't attached to it. The door knob and rod make up which simple machine? _____________________________ 5. A wheel with a rope is used to hoist a flag up to the top of a tall flagpole. This simple machine can also be used to help lift heavy objects with less force. The wheel and rope make up which simple machine? ______________________________ 6. A ramp is used for loading this truck. A mover can pull a cart with a heavy object up the ramp. This is much easier than lifting heavy objects into the truck. -
Do Now: How Many Simple Machines Can You Name?
Do Now: How many simple machines can you name? Simple Machines Lever, Wheel & Axle, and Pulley Would you call any of these items a machine? As you learned in the last section, a machine helps you do work by changing the amount or direction of the force you apply. Machines help to make work easier. An eggbeater, a bolt, and a fishing pole all make use of simple machines. There are six basic kinds of simple machines: the inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley. Levers • Have you ever ridden on a seesaw or pried open a paint can with an opener? • If so, then you are already familiar with a simple machine called a lever. • A lever is a rigid bar that is free to pivot, or rotate, on a fixed point. • The fixed point that a lever pivots around is called the fulcrum. How It Works • To understand how levers work, think about using a paint-can opener. • The opener rests against the edge of the can, which acts as the fulcrum. • The tip of the opener is under the lid of the can. • When you push down, you exert an input force on the handle, and the opener pivots on the fulcrum. • As a result, the tip of the opener pushes up, thereby exerting an output force on the lid. Mechanical Advantage • Levers change your input force and they can change the direction of your input force. • When you use the paint-can opener, you push the handle a long distance down in order to move the lid a short distance up.