Simple Machines Word Search Answer Key

KEY Worksheet - Simple Machines 1.) You apply a force of 18 the paint can is 0.25 on to the end of a lever to open a paint can lid. The length of the fulcrum to , and from the paint can to the lid is 0.020 . The resistance of the lid is 9.0 . Calculate the MA. . Answers - 12.5 . 2.) You apply a force on a crowbar to open a stuck door. The effort length of the crowbar is 26 and the resistance length is 4.0 . Find the MA of the crowbar. Answers - 6.5 . 3.) A worker uses a board that is 4.0 placed 0.50 long long to pry up a boulder. A small rock is used for a fulcrum and is from the resistance end of the lever. Calculate the MA of the board. . Answers - 8.0 . 4.) a.) Three of your friends are all sitting on one end of a seesaw. The combined weight is 275 . The length from the fulcrum to your friends is 2.5 4.5 . The rest of the seesaw (from the fulcrum to you) is . What is the MA? What effort force is needed to lift your friends? . Answers - 1.8 . . Answers - 152.7778 . 150 b.) You want to see if you can lift your three friends when each side of the seesaw is equal in length (3.5 ). What is the MA? What effort force is needed to lift them? . Answers - 1.0 . . 275 . 5.) A person weighing 800. 280 moves an object with a simple machine using all his weight. The mechanical advantage of the machine is MA = 5.0. Determine the mass of the object. Answers - 5.0 4000 6.) The force arm of a lever is 4.0 needed to lift a 1000. 407.747 410 . Calculate the force load, and find out the mechanical advantage of the lever. . . . 7.) The force arm of a lever is 2.0 Answers - 9.81 long and the length of the load arm is 1.0 Answers - can lift making a 200. 4000 . 250 long and the length of the load arm is 80. . Work out the weight we force and calculate the mechanical advantage of the lever. . . . 5.0 10 1 KEY 8.) The force arm of a lever is 1.5 long. We want to lift a 2500. weight applying a 1200. force. Find out the length of the load arm needed and work out the mechanical advantage of the lever. . Answers - . 0.72 . 9.) We want to lift a 8200. weight applying a 820. force. Find out the mechanical advantage needed. How many movable pulleys will we need? . Answers - 9 Pulleys 10 . 10.) A block and tackle has three movable pulleys. Find out the load we can lift applying a 600. force and work out the mechanical advantage of the machine. Answers - # 4 4 . 2400 11.) What is the mechanical advantage of the system pictured on the right? Answers - 12.) If the load is 100. # 4 , how much effort is required to pick up the load for the pulley in the previous question? Answers - 4 245.25 245 13.) What is the mechanical advantage of the system pictured below if the diameter of the wheel is 3.0 and the diameter of the axle is 1.0 ? . Answers - 3.0 . 14.) If Mr. Wilkison can only pull with of force, how much weight can he lift using the wheel and 25 axle system from question 13? Answers 15.) If we build a ramp that is 2.0 3.0 75 high and the length of the ramp is 30. , what is the mechanical advantage? . Answers - 15 . 16.) How much effort force would someone need to push a 45 Answers - . 15 box up the ramp from question 15? 29.43 29 2 KEY 17.) Jose and Suzette construct an arm where the effort is located 10. is 25 from the fulcrum and the load from the fulcrum, what is the mechanical advantage of the arm? . Answers - 0.40 18.) Find the mechanical advantage and the maximum separation load for a wedge used to split the object shown. The wedge has an incline length of 8.0 , an overall height of 2.0 . The effort load applied is 60. . . Answers - 4 . . 4 240 19.) A wheel and axle is used to raise a weight of and axle are 40 . and 10. with an effort of 200 . If the radii of the wheel 720 respectively; What is the efficiency of the machine? Answers - 3.6 . 4.0 . . . 100 90% 3