Simple Machines “The Six Machines That Built The Man Made World”
What is a simple machine? • Simple machines are tools that make work easier. They have few or no moving parts. These machines use energy to work.
Levers • Lever: A lever is a board or bar that rests on a turning point. This turning point is called the fulcrum. An object that a lever moves is called the load. The closer the object is to the fulcrum, the easier it is to move. Examples of Levers: A hammer is a lever when it is used to pull a nail out of a piece of wood. Bottle openers Crow bars
First Class Levers • Examples of first class levers include: See-Saws, Hammer Claw, Pliers, Scissors In a Type 1 Lever, the pivot (fulcrum) is between the effort and the load. In an off-center type one lever (like a pliers), the load is larger than the effort, but is moved through a smaller distance.
2nd Class Levers In a Type 2 Lever, the load is between the pivot (fulcrum) and the effort. Examples Include: Stapler, Bottle Opener, Wheel Barrow, Nail Clippers
3rd Class Levers In a Type 3 Lever, the effort is between the pivot (fulcrum) and the load. Examples Include: Fishing Rod, Tweezers, Tongs.
Wedges • A wedge is an object with at least one slanting side ending in a sharp edge, which cuts material apart.
Pulleys • A pulley is a simple machine that uses grooved wheels and a rope to raise, lower or move a load.
Inclined Plane • An inclined plane is a slanting surface connecting a lower level to a higher level.
Wheel and Axle • A wheel with a rod, called an axle, through its center lifts or moves loads.
Screw • A screw is an inclined plane wrapped around a pole which holds things together or lifts materials.
Simple Machines Quiz • Simple Machine Quiz • 1. A fork is an example ofa: • Pulley, wedge, wheel and axle • 2. A bicycle is an example of a: • wheel and axle, wedge, lever • 3. A bathtub is an example of a/an: • Pulley, screw, inclined plane • 4. A swivel chair is an example of a: • Lever, screw, wedge
Simple Machines Quiz • Simple Machine Quiz • 5. A teeter totter on the playground is a: • Lever, inclined plane, pulley • 6. You would use a pulley to: • cut food, hold pieces of wood together, help open and close venetian blinds