Simple Machines All mechanical devices consist completely of two machines: Lever Incline The purpose of any machine is to make Work easier for humans to.

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Presentation transcript:

Simple Machines All mechanical devices consist completely of two machines: Lever Incline The purpose of any machine is to make Work easier for humans to move a load Work is conserved (kinda how Energy is conserved) The Work you do on a machine can only equal the Work the machine does on the load The benefit of a simple machine is to change the direction and/or amount of the FORCE!!!!!!!

Levers There are 3 classes of levers: Class 1- See left Fulcrum in middle Class 2 Class 3 A Lever consists of, well, the lever, and these 3 parts: Effort Fulcrum Load Effort Load Effort Fulcrum Load Load Effort Fulcrum Fulcrum

Inclines The basic incline is a ramp (duh) You use a small force over a greater distance The incline uses a greater force over a smaller distance Load Effort

Parade of Machines Pulley Wheel & Axle Gear These are types of LEVERS, believe it or not! Screw Wedge These are types of INCLINES

Mechanical advantage

Trebuchet: a “simple” Machine What type of machine: LEVER first class!

At each station, find: Calculate: AMA Force In IMA Force Out Distance In Distance Out Calculate: AMA IMA The efficiency of the machine: AMA = IMA =

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