The general formula for the mechanical advantage ma of levers. Three lever classes by ron kurtus succeed in understanding. Leversmechanical advantage grade 9 free printable tests. You can calculate mechanical advantage by dividing the output force, in newtons, by the input force, in newtons as shown in the formula below. What is the mechanical advantage we gain by using a lever. Levers in the human body levers confer mechanical advantage. The equation for mechanical advantage still applies, so all secondclass levers are force multipliers and all thirdclass levers are speed multipliers. Physics a first course skill and practice worksheets. Common examples of third class levers include tweezers and ice tongs.
What is the mechanical advantage for each of the levers. The activity is wellillustrated and includes a followup worksheet at the end. Less force is dragged over longer distance, but the. A simple, two sided worksheet with formulas for mechanical advantage and work, as well as the units required for ma, work, force, and distance. Name 2 specific examples of where a pulley is used. An editable version of the mechanical advantage worksheet. Pulleys and efficiency objectives calculate the mechanical advantage of pulley systems. Simple machines worksheet warren hills regional school district. Class2 levers pages 1011 you are going to read a story that describes class2 levers and how they are used.
The mechanical advantage for a wheel and axle is the radius of the wheel divided by the radius of the axle wheel and axle a wheel and axle provide a mechanical advantage. Mechanical advantage ma ratio of the magnitude of the resistance and effort forces ratio of distance traveled by the effort and the resistance force calculated ratios allow designers to. Levers and mechanical advantage 8th grade integrated science. What is the mechanical advantage we gain by using a pulley. Short answer response questions must be responded to in complete sentences. However, one advantage of such levers is that the distance moved by the load is greater than the distance moved by the effort. Taught in the ocr specification but can be used with other exam boards such as aqa, edexcel or eduqas. Simple machines worksheet warren hills regional school. Jasmine uses a block and tackle system, pulling with 10 n of force. Write the name of the simple machine that is d escribed questions.
If the question involves calculations, you must show all your math work. Worksheet for mechanical advantage and work, with formulas. In this lab you will be determining the actual mechanical advantage of levers when you adjust the fulcrum, mass and force. A lever with an input arm of 2 meters has a mechanical advantage of 4. Third class levers have the fulcrum and the load at opposite ends and the effort positioned between the two. Though there are different classes of levers, this activity is done with the first class. Clear examples for students of any ability to use in their exam. Oct 27, 2019 levers and mechanical advantage explained simply and made easy to teach. Using this levers worksheet, students match each class to the correct example of lever in order to build their understanding of simple machines. Examples include brooms, tweezers, tongs, cricket bats and tennis racquets. This can give you a mechanical advantage, which can be found by using the principle of work. First and second class levers have a positive mechanical advantage.
What is the mechanical advantage of a lever that has an input arm of 3 meters and an output arm of 2 meters. You can use this skill sheet to practice calculating mechanical advantage ma for two common simple machines. Or you can use the ratio of the input arm length to the output arm length. To calculate the mechanical advantage of levers, you can use one of 2 formulas. Its easy to recognize a lever most things with a handle attached are considered one. The mechanical advantage of a machine tells us how much a machine changes the amount of force you put in compared to how much force the machine puts out. Consider a nut cracker,where the fulcrum the hinge is at one end of the lever instead of somewhere in the middle. Simple machines, ima, ama, and efficiency worksheet. There are several ways to calculate mechanical advantage in levers. If an input force of 202 n is applied to the handles of the wheelbarrow with a mechanical advantage of 2. Mechanical advantage calculations grade 79 workbooks.
Simple machines levers worksheet 1 l3 7 above and the limited size of the meter stick, what is the greatest mechanical advantage that a student could have with this setup. You wave a magic wand and give him a place to stand and a place for the fulcrum, how. Most of the time, levers are used to multiply force to lift heavy objects. Mechanical advantage worksheet calculate the mechanical advantage in the problems with the equation. They will collect data and illustrate their systems for eight different tests. Mechanical advantage effort distance resistance distance ma edrd this formula is used when you are given meters. Aqa gcse pe 91 lever systems and mechanical advantages. Suppose you need to remove a nail from a board by using a claw hammer. Levers simple machines levers are used to help lift heavy objects lever. Worksheet including formulas for practice calculating mechanical advantage of inclined planes using the measurements height and length.
Look at the meter stick to help you answer this one. Levers and mechanical advantage explained simply and made easy to teach. A mechanical advantage of 1 means that the effort force will be the same as the force needed to move the resistance without the simple machine. There are three classes of levers, where the fulcrum, load, and effort are in different places depending on the job. While the output work work done by the machine of a simple machine can never be greater than the input work work put into the machine, a simple machine can multiply input forces or multiply input distances but never both at the same time. In the example opposite, the heavy weight on the left hand side is been lifted by the person because of the lever. Class 1 has the fulcrum placed between the effort and. Levers and mechanical advantage made easy gcse pe 19.
The application of mechanical advantag e applies to the musculoskeletal system. After you read the story, please answer the following questions using complete sentences. Levers simple machines for kids inventors of tomorrow. These series of levers work together to produce coordinated action, some by actual movement dynamic and others by stabilization static.
Simple machines, ima, ama, and efficiency worksheet ideal mechanical advantage ima. Since humans usually provide energy to levers, effort and load are often used instead of input and output. Mechanical advantage of simple machines fulmers physics. What advantage rule can we state about a class2 lever. This activity consists of 10 questions calculating the mechanical advantage of levers, inclinded planes, and wheel and axles from a word problem, definitions of input and output force, and more. How many pennies of effort force would be needed for that mechanical advantage. Write the name of the simple machine that is d escribed questions 14 below. If the efficiency is 90%, what is the actual mechanical advantage. How large is the output force that just lifts the load.
In thirdclass levers, the effort arm is shorter than the resistance arm. Ma resistance force or ma length of effort arm effort force length of resistance arm 1. In this simple machine lesson, students study levers and the mechanical advantage of using levers. If you prefer, you can jump to the handson science activities for kids age 3 6 key concept of levers. You apply a force of 18 n on to the end of a lever to open a paint can lid. Simple machines questions sir wilfrid laurier school board. The mechanical advantage of a lever the mechanical advantage of a lever is the ratio of the length of the effort arm to the length of the load arm. They do not have as high of a mechanical advantage as ideal machine because some of the effort is lost in overcoming.
For example, if the mechanical advantage is 2, onehalf the force will be needed. Worksheets are chapter 8 reinforcement work mechanical advantage and, simple machines, work 19 mechanical advantage, mechanical advantage, science 9 physics work 3 2work and mechanical, simple machines ima ama and efficiency work, tools and equipment part ii activity pulley work, name simple. Advantages of levers activity guide how are biological levers advantageous in different ways. What is the mechanical advantage of the class2 lever. This also covers the general description of lever terminologies. We use simple machines, like levers, to make tasks easier. Lever activity and worksheet this pdf from the colorado school of mines website provides a lesson on the physics behind levers. Mechanical advantage is a number that tells you how a simple machine will change the effort force. Levers are always ready to work and its a good thing as they are able to help us lift heavy objects. Page 1 is based on knowledge of each lever, page two gives content and assistance in understanding each levers mechanical advantage.
To find the ideal mechanical advantage of a lever, use the following equation. The final question is open ended and leads students to the next lesson. If the mechanical advantage is greater than 1, the effort force will be less than the resistance. Student worksheets for lever systems and mechanical advantage. Mechanical advantage worksheet solve the following problems. To find the ideal mechanical advantage of a lever, use the following. The effort distance is the distance from the effort to the fulcrum.
If a gear system gives a speed advantage because of its gear ratio, then it will give you a mechanical disadvantage. Simple machines, ima, ama, and efficiency worksheet ideal mechanical advantage ima 1. However, one advantage of such levers is that the distance moved by the. Big force really big force small force really small force big mass big force there is no mechanical advantage gained here since. Mechanical advantage of a lever is the ratio of the load the lever overcomes and the effort a person or system applies to the lever to overcome some load or resistance. This means that if a driven gear revolves faster than its driver gear, it.
Mechanical advantage motive force arm length resistive force arm length. The input force that is applied to a lever and the output force are related to the lengths of the input and output arms. Mechanical advantage calculations in this chapter, you will learn how to calculate the amount of mechanical advantage lever systems and gear systems give. First class lever second class lever load or resistance effort or applied force fulcrum load applied force force action force action other first class lever examples. Levers in the human body manhattan beach unified school. What would be the mechanical advantage of the lever.
A simple machine would be considered ideal if it had no friction. Ma output force input force first class lever input force q. More effort was required without the inclined plane, meaning that it was harder to life the crate into her truck directly up from the ground. Mechanical advantage of levers lab miss kellys science. However, levers come in a wide variety of shapes and configurations.
Skill and practice worksheets river dell regional school. The equation for mechanical advantage still applies, so all secondclass levers are force multipliers and all thirdclass levers are. Levers are used to lift heavy weights with the least amount of effort. The following websites contain biographies of frank lloyd wright author. You will also learn how to calculate the speed with which a gear in a gear system will rotate if you know how many teeth each gear has, and the speed with which the other gear is rotating.
Length of effort arm mechanical advantage lenght of load arm effort voa load the mechanical advantage of this 1st class lever is. The mechanical advantage for a gear system is the ratio of the torque on the output gear to the torque on the input gear. Displaying all worksheets related to mechanical advantage problems. Some of your body parts can be thought of as simple machines or levers. The mechanical advantage of a lever is the ratio of the length of the effort arm to the length of the load arm. Gcse pe lever systems and mechanical advantage student. The worksheets allow students to understand the three types of levers and their mechanical advantages. The skeletal and muscular systems work together to move your body parts. Find levers mechanical advantage lesson plans and teaching resources. Third class levers have a mechanical disadvantage, meaning you use more force that the force of the load you lift. This post explains what is the mechanical advantage of a lever and finds out its formula. Mechanical advantage ma ratio of the magnitude of the resistance and effort forces. During our simple machines unit, we learned about levers. Big force really big force small force really small force big mass big force there is no mechanical advantage gained here since the force required to pull the mass is the same as the force of the mass itself.
68 359 102 750 163 773 590 687 1566 1398 41 1368 138 1060 490 1020 979 1199 396 1135 488 940 185 1124 954 977 396 796 350 875 1102 899 1162 1078 176 556 855 1323 147 1262 1188 917 58 2 33 987 698