What is Inclined plane?
[[File:Kiasma_entrance_hy.jpg|thumb|An inclined plane allows to access the upper floor]] An '''inclined plane''' is a [[simple machine]]. It allows one to use less [[Force (physics)|force]] to move an [[wikt:object|object]]. Examples of inclined planes are [[ramp]]s, sloping roads and hills, [[plow]]s, [[chisel]]s, [[hatchet]]s, carpenter's [[Plane (tool)|planes]], and [[Wedge (mechanics)|wedges]]. The typical example of an inclined plane is a sloped surface; for example a [[road]]way to bridge at a different height. Another simple machine based on the inclined plane is the [[blade]], in which two inclined planes placed back to back allow the two parts of the cut object to move apart using less force than would be needed to pull them apart in opposite directions. ==Calculation of forces acting on an object on an inclined planes == [[File:Free body.svg|right|300px|thumb|Key:<br>N = [[Normal force]] that is perpendicular to the plane<br>m = [[Mass]] of object<br>g = Acceleration due to [[gravity]]<br>θ ([[Theta (letter)|theta]]) = Angle of elevation of the plane, measured from the horizontal<br>''f'' = [[Friction|frictional force]] of the inclined plane]] To calculate the forces on an object placed on an inclined plane, consider the three forces acting on it. # The [[normal force]] (''N'') exerted on the body by the plane due to the attraction of [[gravity]] i.e. mg cos θ # the force due to gravity (''mg'', acting vertically downwards) and # the [[friction|frictional force]] (''f'') acting parallel to the plane. We can break the force from gravity into two vectors, one perpendicular to the plane and one parallel to the plane. Since there is no movement perpendicular to the plane, the component of the gravitational force in this direction (''mg'' cos ''θ'') must be equal and opposite to normal force exerted by the plane, ''N''. Therefore, <math>N=mgcos	heta</math>. If the component of the force from gravity parallel to the surface (''mg'' sin ''θ'') is greater than the [[static friction]]al force ''f<sub>s<