Editing Inclined plane (section)

===Slope===
The [[mechanical advantage]] of an inclined plane depends on its ''[[slope]]'', meaning its [[Grade (slope)|gradient]] or steepness.  The smaller the slope, the larger the mechanical advantage, and the smaller the force needed to raise a given weight.  A plane's slope ''s'' is equal to the difference in height between its two ends, or "''rise''", divided by its horizontal length, or "''run''".<ref name="Handley">{{cite book   
  | last = Handley 
  | first = Brett 
  |author2=David M. Marshall |author3=Craig Coon
   | title = Principles of Engineering
  | publisher = Cengage Learning
  | year = 2011
  | pages = 71–73
  | url = https://books.google.com/books?id=3YBeXkp-AacC&q=%22inclined+plane%22+slope+angle+%22mechanical+advantage%22&pg=PT91
  | isbn = 978-1-4354-2836-2}}</ref> It can also be expressed by the angle the plane makes with the horizontal, <math>\theta</math>.

[[File:Inclined plane terminology.svg|thumb|The inclined plane's geometry is based on a [[right triangle]].<ref name="Handley" /> The horizontal length is sometimes called ''Run'', the vertical change in height ''Rise''.]]
  
:<math>\theta = \tan^{-1} \bigg( \frac {\text{Rise}}{\text{Run}} \bigg)   \,</math>