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Introduction to Mechanical Advantage. Refer back to the discussions of each simple machine for the specific equations for the IMA for each type of machine. For a pulley system, the input distance is how far you pull the rope, and the output distance is the distance the load rises.

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Give some examples: hand-powered windlass, steering wheel, door knob, and so on. 8(b) shows the how a lever works mathematically. Work and machines worksheet pdf download. Identify each object and write which simple machine it is. Pulleys can still be seen in use, most commonly on large building cranes. In most cases, a simple machine is used to reduce the amount of force you must exert to do work. Explain how heat lost because of friction assures that Wo will always be less than Wi preventing efficiency from ever reaching 100%.

Bicycles include wheel and axles, levers, screws, and pulleys. While we push staples through pieces of paper in order to fasten them together nearly every day, little do we realize we are making a simple machine, a lever to be specific, work hard. Knives and axe heads are examples of wedges. Use the Check Your Understanding questions to assess students' achievement of the section's learning objectives. Look back at the pictures of the simple machines and think about which would have the highest efficiency. In this PDF packet, you will receive 3 worksheets, wherein students can identify common items that are created using simple machines. It shows a derivation using trig functions that is beyond the scope of this chapter. Work and machines worksheet pdf free. Ask them first to try to sketch these. For an additional fun activity, have the students search the Internet for Rube Goldberg machine. Since both have different weights, they will never be in balance.

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The circular handle of a faucet is attached to a rod that opens and closes a valve when the handle is turned. Lever||mechanical advantage||output work||pulley||screw|. Any crank-operated device is an example of a wheel and axle. The mechanical advantage is a number that tells us how many times a simple machine multiplies the effort force. Both the input work (Wi) and output work (Wo) are the result of a force, F, acting over a distance, d. The efficiency output of a machine is simply the output work divided by the input work, and is usually multiplied by 100 so that it is expressed as a percent. As shown in the figure, the ideal mechanical advantage is calculated by dividing the radius of the wheel by the radius of the axle. Work and machines worksheet pdf class 12. Explain that the combined mechanical advantage can be great. For a screw, the input distance is the circumference of the circle over which the force is applied, and the output distance is the distance between the screw threads. Explain why more energy is usually lost to friction with these machines than with other simple machines. An inclined plane and a wedge are two forms of the same simple machine. The ideal mechanical advantage, IMA, is the mechanical advantage of a perfect machine with no loss of useful work caused by friction between moving parts. As you get rolling with our simple machines worksheets pdf, watch the little engineers frantically sort mechanical devices into one of the six types of simple machines, label machines as simple or complex, and match pictures of simple machines to the names of their type. AL] Ask for recall of the formula W = f d. Explain that the product of force and distance is critical to understanding simple machines. How would lubrication affect the efficiency of a simple machine?

Beautifully baked into our free, printable simple machines worksheets is the fact that in life we are increasingly at the mercy of machines, simple or complex, and therefore we must equip ourselves to identify each machine that we encounter every day as a lever, pulley, inclined plane, wedge, wheel and axle, or screw. The screw shown in Figure 9. Simple machines are the building blocks for creating more complex machines. Show them that it looks more like a lever if the wheel is replaced by a crank. The student is expected to: - (C) describe simple and complex machines and solve problems involving simple machines; - (D) define input work, output work, mechanical advantage, and efficiency of machines. Ask them why steering wheels had a greater diameter before power steering was invented.

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AL]Tell students there are two other classes of levers with different arrangements of load, fulcrum, and effort. Not only does this simple machines worksheet work well as an instant pick-me-up for the thriving scientists in 3rd grade and 4th grade, it charmingly illustrates the characteristics of each simple machine type. The student knows that changes occur within a physical system and applies the laws of conservation of energy and momentum. BL] [OL] Talk about how inclined planes and wedges are similar and different. Wo and Wi can always be calculated as a force multiplied by a distance, although these quantities are not always as obvious as they are in the case of a lever. How could you use a pulley system to lift a light load to great height? This results in a smaller force acting over a greater distance at the end of the resistance arm. For a wheel and axle, the input distance is the circumference of the wheel, and the output distance is the circumference of the axle. Ask for an explanation of the 2 in the equation for IMA. Increase the number of ropes supporting the load. Note that, when using an inclined plane the load moves, but when using a wedge the load is stationary and the machine moves.

Watch children in 4th grade and 5th grade flit between the simplicity and complexity of machines. If the rod has a diameter of 1 cm and the IMA of the machine is 6, what is the radius of the handle? It is actually a form of lever. 4 m, which lifts a 40 N weight resting on the resistance arm a distance of 0. For instance, a bicycle is created using wheels, levers, and pulleys. The down side is that you must exert the force over a greater distance, because the product of force and distance, f d, (which equals work) does not change. The equation for IMA is shown in Figure 9. The equations show how a simple machine can output the same amount of work while reducing the amount of effort force by increasing the distance over which the effort force is applied.

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Dispel any misconceptions that machines reduce the amount of work. An answer key is included for each worksheet. The first part of this video shows how to calculate the IMA of pulley systems. This way bales of hay could be lifted into the hay loft without getting wet. Our worksheets on the simple machines are ideal for grade 3, grade 4, and grade 5. True or false—The efficiency of a simple machine is always less than 100 percent because some small fraction of the input work is always converted to heat energy due to friction. Note that the IMAs of the individual simple machines in a complex machine usually multiply because the output force of one machine becomes the input force of the other machine. The other three are not as obvious. In real life, some of the applied work always ends up as wasted heat due to friction between moving parts. 1 m. What is the efficiency of the machine?

AL] Ask students how the forces exerted by a wood screw are different from those exerted by the screw in Figure 9. The input force of 11 N acting on the effort arm of a lever moves 0. Recall that in closed systems the total amount of energy is conserved. This video shows how to calculate the IMA of a lever by three different methods: (1) from effort force and resistance force; (2) from the lengths of the lever arms, and; (3) from the distance over which the force is applied and the distance the load moves. When you prod the cake with your fork, the simple machine in action is a wedge.

Simple Machines Worksheets. Combining this with the information in the paragraphs above, we can write. If a pulley system can lift a 200N load with an effort force of 52 N and has an efficiency of almost 100 percent, how many ropes are supporting the load? The input and output distances are easier to see for the lever, inclined plane and wedge. All sloping, paved surfaces for walking or driving are inclined planes. After they have discovered the three kinds, with or without your help, ask if they can think of examples of the types not shown in Figure 9. Although it cannot change the amount of work you do, a simple machine can change the amount of force you must apply to an object, and the distance over which you apply the force. Efficiency is related to friction, and friction depends on the smoothness of surfaces and on the area of the surfaces in contact. 13 combine two levers and two wedges. The heavier child sits farther from the fulcrum. The simple machine shown in Figure 9. BL] [OL] See if the students grasp the idea that a wheel and axle is really a type of lever. 4 ropes are required because the actual mechanical advantage is 3. Instruct the child to cut each simple-machine picture and glue it beside the description that best matches.

Pulley systems are often used to raise flags and window blinds and are part of the mechanism of construction cranes. 9 is called a wheel and axle. Energy loss to friction is reduced, but nothing is lifted. Most students should skip to the final two or three minutes which explain the basics of calculating IMA of a lever from different ratios. This is the underlying principle of all simple machines. Both children sit at equal distance from the fulcrum. No simple or complex machines have the actual mechanical advantages calculated by the IMA equations.

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