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This lesson introduces students to three of the six simple machines used by many engineers. These machines include the inclined plane, the wedge and the screw.

Know / Want to Know / Learn (KWL) Chart: Create a classroom KWL chart to help organize learning about a new topic. On a large sheet of paper or on the classroom board, draw a chart with the title "Simple Machines: Inclined Planes and Screws." Draw three columns titled, K, W and L, representing what students know about inclined planes and screws, what they want to know about inclined planes and screws and what they learned about inclined planes and screws and their mechanical advantages. Fill out the K and W sections during the lesson introduction as facts and questions emerge. Fill out the L section at the end of the lesson.

The inclined plane is often the simplest of all the simple machines because it does not move when you use it; it just sits still. The purpose of an inclined plane is to move something from a lower height to a higher height. An inclined plane can be something as simple as a driveway or a staircase. Have you ever used one of these?

Have students research Archimedes' screw and write a brief report describing how this device works, drawing sketches and providing their own examples of everyday ways it might be used to help people.

In this lesson, students learn about work as defined by physical science and see that work is made easier through the use of simple machines. Already encountering simple machines everyday, students will learn about their widespread uses in improving everyday life.

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simple machine: A machine with few or no moving parts that is used to make work easier (provides a mechanical advantage). For example, a wedge, wheel and axle, lever, inclined plane, screw, or pulley.

Today, we learned about two simple machines; the inclined plane and the screw. Who can give me an example of an inclined plane? (Possible answers: Ramp, staircase, escalator.) How does an inclined plane help us do work? (Possible answer: We push objects up an inclined plane.) What is the trade-off? (Answer: Distance) What are two ways screws are used? (Answer: To fasten objects or to lift something.) What other simple machine often helps us use a screw? (Answer: A lever.) What has an engineer designed that uses an inclined plane or a screw? (Possible answers: Parking garage, ramp, escalator, drilling rig, holding parts of something together, such as an airplane or MP3 player.)

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inclined plane: A simple machine that raises an object to greater height. Usually a straight slanted surface and no moving parts, such as a ramp, sloping road or stairs.

Apr 14, 2021 — Strain hardening, also referred to as cold working or work hardening, is the process where metals are made stronger and harder through ...

3-PS2-1. Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object. (Grade 3)

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A screw is a simple machine that has two purposes. It can be used to fasten two or more objects together or it can be used to lift up a heavy object. In most applications, a lever is used to turn the screw. A good example of this is a screwdriver. It is the circumference of the lever or screwdriver and the pitch of the screw that determines the mechanical advantage of the screw.

While a screw is considered a simple machine, it depends upon another simple machine, the lever, to do work Have you ever seen or used a screw to hold some wood together? How do you get the screw into the wood? Well, you use a screwdriver or a drill. The screwdriver is a type of lever that helps turn the screw into the wood. A screw is really just a cylinder with an inclined plane wrapped around it. The pointed end of a screw works like a wedge (another simple machine!), but the screw is different from a wedge because it gets its power from being turned by a lever, not from applying a direct force to push it into an object.

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Simple machines help us complete a task more easily. What are some of the simple machines we have been studying? (Possible answers: Wedge, wheel and axle, lever, inclined plane, screw and pulley.) Today we are going to look at two of the six simple machines— the inclined plane and the screw.

spiral: A curve that winds around a fixed center point (or axis) at a continuously increasing or decreasing distance from that point.

There is always a trade-off, though, to moving something in a way that takes less effort. In an inclined plane the trade-off is distance. If you compare the length of a ladder to that of a ramp going up to the second floor of a building, you find that the length of the ladder is much shorter. The distance up the ramp is longer but it takes less effort to walk up. Have you experienced this mechanical advantage? People from ancient cultures figured this out a long time ago when they built the pyramids using long ramps to help them move the heavy stones to the top! Mechanical engineers today use inclined planes in many engineering designs for moving things up such as parking garages, tow trucks, conveyer belts and escalators.

The purpose of an inclined plane as a simple machine is to move something from a lower height to a higher height with less effort. An object simply placed on a tilted surface often slides down the surface (see Figure 1) because of the force in the downhill direction. In other words, the forces in this scenario are unbalanced (i.e. there is no upward force to counteract the downward force and therefore, the object would slide down).The rate at which the object slides down is dependent upon how tilted the surface is; the greater the tilt of the surface, the faster the rate at which the object will slide down it. This is measured by the angle of inclination. Students can find this using a protractor. Friction also affects the movement of an object on a slope. Friction is a force that offers resistance to movement when one object is in contact with another. Imagine now that you were on the downside of the object and applying force to keep the object in the same place (not moving). To keep the object stationary, the force you would have to apply would need to equal the downward force due to gravity. That would be an example of balanced forces. If you wanted to push the force upwards, you would need to exceed the force of gravity.

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Using the Equations: Provide additional sample problems (similar to the examples given in the Lesson Background) for students to calculate themselves the mechanical advantage of an inclined plane and of a screw. Have them use the equations provided in the Lesson Background for the mechanical advantage of an inclined plane and a screw.

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Have students look at an assortment of different screws and calculate the mechanical advantage of each. Which one has the greatest mechanical advantage, the least? Have them screw different fasteners into wood. Can you feel and see the difference in mechanical advantage of a screw that has close threads vs. one that has threads farther apart?

Have students build upon their understanding of inclined planes by discussing different uses for ramps. In what situation might you make a ramp shorter/longer, shallower/steeper? When might you add friction to make the ramp work better? Draw pictures of different ramps for different uses. How do they differ?

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The mechanical advantage of an inclined plane depends upon its slope and height. To find the ideal mechanical advantage of an inclined plane, divide the length of the slope by its height.

A screw can function in two ways: it can raise up a weight, and it can fasten two or more objects together. An example of using a screw to raise a weight is when it is used to get oil. Oil coming from a deep well can easily be pumped out with the aid of the pumping screw. Archimedes was a famous mathematician and inventor who more than two thousand years ago designed the Archimedes screw — a machine that was turned by horses or people to raise water.

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Students use inclined planes as they recreate the difficult task of raising a monolith of rock to build a pyramid. They compare the push and pull of different-sized blocks up an inclined plane, determine the angle of inclination, and learn the changes that happen when the angle is increased or decre...

Investigation: Have students investigate balanced versus unbalanced forces on their own at home. Instruct them to follow these steps and answer the given questions:

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The ideal mechanical advantage of a screw is found approximately by dividing the circumference of the lever by the pitch of the screw. For example, if an 8 inch wrench is used to tighten a bolt with a pitch of 1/5 inch, then the ideal mechanical advantage is π*8 inches / (1/5 inch)= 126.

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If our same screw with 1/5 pitch is turned using a 1-inch circumference screwdriver, then the ideal mechanical advantage becomes 1 ÷ 1/5, or 5.

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Wright, Richard. Ladies and gentleman... the inclined plane! PCS Education Systems, Inc. Accessed January 25, 2006. http://www.weirdrichard.com/inclined.htm

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Students are introduced to the six types of simple machines — the wedge, wheel and axle, lever, inclined plane, screw, and pulley — in the context of the construction of a pyramid, gaining high-level insights into tools that have been used since ancient times and are still in use today.

When we use a screw to fasten objects, the screw converts rotating motion of turning the screw into straight-line motion of the screw into wood or other material. That is what gives the screw its mechanical advantage. It takes less force to turn a screw into a hard material than to pound a wedge into the same material. Engineers today use screws in many engineering applications and designs such as drilling rigs that bring up oil, dirt or water. Have you ever seen a car jack raise a car to help change a flat tire? Well, that is an example of a screw as well. Engineers also use screw as fasteners for large objects such as sports stadiums or airplanes, and for smaller objects such as desks or MP3 players. Today we are going to take a closer look at two simple machines — the inclined plane and the screw. How do you think they may have helped build the ancient pyramids? Following the lesson refer to the activity Watch It Slide! for students recreate the difficult task of raising a monolith of rock to build a pyramid using inclined planes.

An inclined plane produces a mechanical advantage to decrease the amount of force needed to move an object to a certain height; it also increases the distance the object must move. The object moving up an inclined plane needs to move the entire length of the slope of the plane to move the distance of the height. For example, if you have a ramp with a slope length 20 meters that rises 5 meters high, then your trade-off is moving the 20 meters distance versus lifting straight up 5 meters, and your ideal mechanical advantage is 4.

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mechanical advantage: An advantage gained by using simple machines to accomplish work with less effort. Making the task easier (which means it requires less force), but may require more time or room to work (more distance, rope, etc.). For example, applying a smaller force over a longer distance to achieve the same effect as applying a large force over a small distance. The ratio of the output force exerted by a machine to the input force applied to it.

Henderson, Tom. Lesson 3: Forces in Two Dimensions: Inclined Planes. The Physics Classroom (a high school physics tutorial). Accessed January 25, 2006. http://www.compadre.org/precollege/items/detail.cfm?ID=2014

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pyramid: A massive structure of ancient Egypt and Mesoamerica used for a crypt or tomb. The typical shape is a square or rectangular base at the ground with sides (faces) in the form of four triangles that meet in a point at the top. Mesoamerican temples have stepped sides and a flat top surmounted by chambers.

To understand an object's motion on an inclined plane, it is important to analyze the forces acting upon it. The force of gravity (also known as weight) acts in a downward direction. When the angle of inclination is greater, and the slope is steeper there is more weight component to overcome. With a shallower slope the weight component is easier to overcome and requires less effort.

Oct 17, 2023 — Anyone familiar with fabricating the old fashioned flat screw plates that were replaced by dies and handles. I watched Wallace Gussler in ...

Closing Discussion: Ask students to explain why it is easier to pull a cart or block up a long, shallow ramp than taking it up steps, a ladder or a steep ramp. Ask them to give examples of mechanical advantage using an inclined plane or a screw.

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Mesoamerica: A region extending south and east from central Mexico to include parts of Guatemala, Belize, Honduras and Nicaragua. In pre-Columbian times it was inhabited by diverse civilizations, such as the Mayan and the Olmec.

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Bingo: Provide each student with a sheet of paper containing a list of the lesson vocabulary terms. Have each student walk around the room and find a student who can define one vocabulary term. Students must find a different student for each word. When a student has all terms completed they shout "Bingo!" Continue until two or three (or most) students have bingo. Ask the students who shouted "Bingo!" to give definitions of the vocabulary terms.

Dec 16, 2022 — Callout Symbols. The '⌴' symbol is used to indicate a counterbore hole on engineering drawings. The depth number and the diameter symbol are ...

In other lessons of this unit, students study each simple machine in more detail and see how each could be used as a tool to build a pyramid or a modern building.

KWL Chart (Conclusion): As a class, finish column L of the KWL Chart as described in the Pre-Lesson Assessment section. List all of the things students learned about inclined planes and screws and their mechanical advantages. Were all of the W questions answered? What new things did they learn?

Figure 1: This diagram shows how ancient cultures used inclined planes to move heavy stones to the top of their pyramids. The force of gravity, friction and the pull force all affect how easy (or hard) it is to pull the cart up the inclined plane.copyrightCopyright © 2005 Travis Reilly, ITL Program, College of Engineering, University of Colorado Boulder

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The mechanical advantage of a machine is the ratio of the load to the applied force. In other words, mechanical advantage determines how much force we need to perform a task. For example, the greater the mechanical advantage of a machine, the less force we need to have to perform a task such as moving an object. The opposite is true as well. Mathematically, mechanical advantage (MA) = load ÷ applied force. A good mechanical advantage is one that is greater than 1.

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A screw is another form of an inclined plane; it is simply an inclined plane wrapped around a rod, like a spiral. (If available, pass around a few screws for the students to examine.) A screw is also the second simple machine we are going to study today. Can you think of some everyday examples of inclined planes or screws? (Answers: Ladder, ramp, slide, stairs, bolt, screw, drill.)

Engineers use simple machines to build taller, stronger and more durable buildings. They use inclined planes in the design of many devices. For example, ramps are inclined planes that make it easier for people in wheelchairs move to a higher location instead of using the stairs. Parking garages are designed on the use of inclined planes to get cars to the next level of parking. Screws are used to raise something or fasten two or more things together. Engineers design machines around large screws, such as drilling rigs to raise oil or dirt, and use smaller screws to fasten together a wide range of items, from the space shuttle to an electric toothbrush.

The pitch of a screw is the distance between adjacent threads on that screw. The pitch can be calculated by dividing a certain distance by the number of threads on screw. For example, if you have a screw fastener with 5 threads over an inch of the screw, then the pitch of the screw is 1/5. One complete revolution of the screw into an object is equal to the distance of the pitch of a screw. Or, in this example, one turn of the screw would move the screw a distance of 1/5 inch.

An inclined plane works by helping you lift things up to a higher level. Have you ever tried to carry something heavy up a ladder? It's pretty hard! How about carrying that object up a staircase instead? Is that easier? It sure is! Carrying a heavy object up a staircase is easier than a ladder, and carrying it up a smooth ramp is even easier. Why is that so? (Answer: You do not have to lift as much with your legs.)