PPT-Mechanical Advantage and Efficiency

Chapter 14 Section 3 Mechanical Advantage The mechanical advantage of a machine is the number of times that the machine increases an input force Suppose a nut is in a nutcracker at position A . Work & Machines. What is work?. Work is done when a force causes an object to move in the direction of the force.. Transfer of kinetic energy. Applying a force does NOT always result in work being done.. What do simple machines do for us anyway?. There are four ways that a machine helps us to do work.. Transfers our effort force from one place to another. Ex: seesaw. Multiply your effort force. Ex: crowbar. and. Mechanisms. Pulleys. A pulley wheel is a mechanism which helps move or lift objects.. . pulley. Exercise machine. Pulleys. Parts of a Pulley System. Direction of Force. Notice that the pulleys change the direction of the applied force. . 14) explain the relationship between work and power (using narrative and mathematical descriptions) and apply to realistic situations (GPS, HSGT) (SCPH_C2005-14). 14a) calculate the work on a body by constant force. Work is done when a force is applied through . a distance. Work input: the work that you do on a machine. Work output: the work done by the machine. Machines do not increase the amount of work done. Work output is never greater than work input.. 2. Law of Conservation. Energy . cannot be created or destroyed. .. It does not appear or disappear, can only be . converted from one form to another. .. However, we usually find that the . output. . Lesson 6. Mechanical Advantage and Efficiency . Simple machines allow us to move objects with less effort force then the load force due to force advantage. . The force advantage can be found by dividing the load force by the effort force, . Device Construction. © 2012 Project Lead The Way, Inc.. Principles of Engineering. Presentation includes: instructions for building a simple machines device and measuring mechanical advantage. Base Equipment. . 1. . A crate of bananas weighing 3000 N is shipped from South America to New York, where it is unloaded by a dock worker who lifts the crate by pulling with a force of 200 N on the rope of a pulley. What is the actual mechanical advantage of the system? . What is a machine?. A machine is simply a device that makes doing work easier. . Even a sloping surface can be a machine. . Using Machines. Mechanical Advantage. Even though machines make work easier, they don’t decrease the amount of work you need to do. . How do you measure mechanical efficiency? Energy, Work and Mechanical Efficiency Mechanical Efficiency Mechanical efficiency is a comparison of the useful work or energy that a mechanical system produces to the work or energy that was put into the system. Warm Up: (5 min) Go to my website: whitneystrickland.weebly.com Click on the assignments tab There is a link for today’s warm up beside Friday. Click on the link and play the Burglar Challenge. When you have completed the challenge, raise you hand to show me! 14-3 Mechanical Advantage and Efficiency Answer on a separate sheet of paper Objectives: 1. How does the actual mechanical advantage of a machine compare to its ideal mechanical advantage? 2. Why is the efficiency of a machine always less than 100 percent? Learning Objectives. I can mathematically rearrange the mechanical advantage equation.. I can calculate . mechanical advantage . using the formula.. Actual Mechanical Advantage (AMA). The ratio of the output force to the input force in a machine. Measuring the actual forces on the machine..