Introduction

A machine is any device that either increases or regulates the effect of a force or produces motion. All agricultural machines are composed of combinations and modifications of two basic machines, the lever and the inclined plane. We will study the basic principles surrounding these two machines and illustrate some of their common modifications and uses. (Note: In the following discussion of simple machines two assumptions are made: losses due to friction are ignored, and the strength of the materials is not considered.)

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