Transcript of Copy of Simple Machines
Simple Machines By Kasey Cwalina Science in Film In the clip I'm about to show you from the 1968 british film, Chitty Chitty Bang Bang, Caractacus Potts, the eccentric inventor, lives with his two young children and his elderly father and is always tinkering with his newest machine. In this scene you will see the contraption he uses to make making meals a little bit easier. Take out a piece of paper and try to list all the simple machines you see, be on the lookout, there are a lot! You probably wouldn't have even noticed that almost the entirety of that contraption was made from simple or compound machines if i hadn't told you to watch out for them before. This is because they have become such a normal occurrence in our daily lives that we don't think anything of them. What are Simple Machines? A simple machine is a device that makes work easier. What is work? Work is done whenever a force is exerted. Simple machines CAN make work easier however, the machine can NOT change the amount of work done, only the size and direction of the force, and the distance. There are six simple machines, they consist of the pulley, the wedge. the inclined plane, the lever, the screw and the wheel and axle. Now, the six simple machines... #1: The Pulley What is a Pulley? A pulley: A pulley is a wheel on an axle that is designed to support movement of a cable or belt along its circumference. Pulleys are used in a variety of ways to lift loads, apply forces, and to transmit power. #2: The Wedge What is a wedge? A wedge is a simple machine used to push two objects apart. A wedge is made up of two inclined planes. These planes meet and form a sharp edge. This edge can split things apart. #3: The Inclined Plane Inclined Plane: An inclined plane is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load. The longer and less steep the incline is, the easier the work will be, and vise versa. #4: The Lever A rigid bar resting on a pivot (the fulcrum), used to help move a heavy or firmly fixed load with one end when pressure is applied to the other. There are three different types of levers. First Class Levers: A lever in which the fulcrum is positioned between the load and the effort. Second Class Levers: A lever in which the load lies between the fulcrum and the effort. Third Class Levers: A lever in which the effort is placed between the fulcrum and the load. #5: The Screw A screw: a simple machine of the inclined plane type consisting of a spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits. Screws hold things together by being rotated and held tightly in place. #6:The Wheel and Axle A wheel and axle: A simple machine that has one or two wheels rotating along the same axis, also called the fulcrum at times. Review 1. What is a simple machine? (In your own words)Full transcript
2. Name the six simple machines.
3. What is a compound machine?
4. Give examples of compound machines that are not already given. What are compound machines? Compound machines consists of at least two simple machines put together. Examples of some compound machines are bicycles and scissors. This is because scissors are the result of a wedge AND a lever. While scissors only have two simple machines, a bike is much more complex and has many more simple machines in it, A bike has screws that are used to hold the pieces together. The wheel of a bicycle is a wheel and axle. The pedals are attached to a lever that turns a pulley. The gear shifts and brake handles are levers. DISCUSSION QUESTIONS #1: From what you already knew from class and this review, list some ways simple machines help us in our every-day life. #2: Look back on your day so far. You have probably already used several simple machines without even realizing it. Reflect and list some of the machines you used. #3: Do you think simple machines are helpful and beneficial? Or do you think it just makes people lazier? This argument can go either way.