Simple Machines How to create Mechanical Advantage? By Mr. Yersak

Objectives Students should be able to: Calculate the efficiencies of basic power systems Calculate force multiplication ratios for simple power systems Create solutions to technological problems by using safe and appropriate tools and techniques associated with power systems. (LEGO Fast Car/ Battle Bot Competition)

What are Simple Machines?

Simple Machines Levers Pulleys Wheels and Axles Inclined Planes Screws Wedges Gears Devices that create Mechanical Advantage Mechanical Advantage: The extent at which a machine makes work easier

Levers Definition: Fulcrum: 1st Class Lever: 2nd Class Lever: Effort Resistance Definition: A rigid bar that rotates (turns) around one fixed point. Fulcrum: Fixed Point Fulcrum 1st Class Lever: Resistance Effort Fulcrum 2nd Class Lever: Resistance Fulcrum Effort 3rd Class Lever:

Pulleys Definition: Fixed Pulley: Moveable Pulley: Changes the direction of force Definition: Solid discs with a groove that rotate around a center axis. Effort Moveable Pulley: Force directions stay constant Effort

Wheels and Axle Definition: A wheel is a lever arm fixed to a shaft called an axle. Effort Resistance

Inclined Planes Definition: A sloped flat surface with a fixed plane Resistance Definition: A sloped flat surface with a fixed plane Effort

Screws Definition: A long inclined plane wrapped around a shaft Effort Resistance

Wedges Definition: Consists of two inclined planes placed back to back Effort Resistance Definition: Consists of two inclined planes placed back to back

Gears Definition: A metal wheel with small notches, or teeth, cut into its rim Resistance Effort