Simple Machines Presented by Kesler Science Essential Questions

Simple Machines Presented by Kesler Science

Essential Questions: 1. How do simple machines change the amount of force or direction needed to move an object? 2. How do simple machines make work easier?

Simple Machines A simple device for changing the amount or force or direction of force to move an object. © Kesler. Science. com

Quick Action – INB Template Types of Levers INB Template 1. Cut out the levers template. 2. Fold along the dotted line to create flaps 3. Glue it into your journal. © Kesler. Science. com

Simple Machines Lever • A simple machine made of a bar that pivots on a fixed support, or fulcrum. • A force applied by pushing down on one end of the lever results in a force pushing up at the other end. • A change in direction makes work easier © Kesler. Science. com Load Lever

Simple Machines 3 Classes of Levers • 1 st class lever - fulcrum placed between the effort and load • Ex. Seesaw © Kesler. Science. com Fulcrum

Simple Machines 3 Classes of Levers • 2 nd class lever - load in between the effort and the fulcrum • Ex. Wheelbarrow © Kesler. Science. com Fulcrum

Simple Machines 3 Classes of Levers • 3 rd class lever - effort in between the load and the fulcrum • Ex. Baseball bat © Kesler. Science. com

Simple Machines Notes Example Page © Kesler. Science. com

Quick Action – Simple Machine - Lever • Get with your seat partner. • Brainstorm how many levers you can see in your classroom. • Make a quick chart in your INB that lists 1. Name of lever 2. 1 st, 2 nd or 3 rd class lever © Kesler. Science. com Lever name 1 st class 2 nd class 3 rd class

Quick Action – Simple Machines - Lever • Discuss whether each lever you identified is a 1 st, 2 nd, 3 rd lever. • Demonstrate using a pencil, a 1 st, 2 nd, and 3 rd class lever. © Kesler. Science. com Lever name 1 st class 2 nd class 3 rd class

Quick Action – INB Template Simple Machines INB Template 1. Your teacher will instruct you how to cut out the template. 2. Glue it into your journal and wait for instruction. © Kesler. Science. com

Simple Machines Wheel and Axle • A wheel attached to an axle • These two parts rotate together. • A force is transferred from one to the other. • Axle moves faster than the wheel making work easier. (increases speed) © Kesler. Science. com

Simple Machines Pulley • A pulled rope over a wheel • Changes the direction of force • Increases the applied force making work easier © Kesler. Science. com

Simple Machines Incline Plane • A flat surface raised at an angle – like a ramp • Used for lifting a heavy load instead of straight up • The angle (steepness) determines effort needed to raise the weight. • The increased distance decreases the force required. © Kesler. Science. com Eff or t

Simple Machines Wedge • Made up of two inclined planes put together • These 2 planes meet and form a sharp edge. • Used to push objects apart, or cut • The thinner the wedge the easier the work. © Kesler. Science. com

Simple Machines Screw • A spirally grooved solid cylinder • An incline plane wrapped around a cylinder • The less distance between threads the easier the work. © Kesler. Science. com Distance between threads Threads

Quick Action – Simple Machines - Screw • Take out a sheet of paper and fold one corner to the edge of the opposite side. • Crease along the fold and cut off the triangle you just made. © Kesler. Science. com

Quick Action – Simple Machines - Screw • Using a marker, draw a line along the longest edge of the triangle (both sides). • Lay your pencil along the shortest side of the triangle and roll the paper around the pencil. • How does a screw make work easier? © Kesler. Science. com

Simple Machines Notes Example Page © Kesler. Science. com

Check for Understanding Can you… 1. Describe how each simple machine makes work easier? 2. Explain how simple machines change the amount of force or direction needed to move an object? © Kesler. Science. com