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dynamics2.gif (411 bytes)

Legend

Fnet

 = net force

m 

= mass

a 

= acceleration

Fg

 = force of gravity

FN

 = normal force

Ff

 = force of friction
Image of a typical house with tilted sides to the roof
這個建築物屋頂是刻意築成斜面，當冬天時雪一多便能滑下，而非積壓在建築物上•

斜面
雖然地心引力在一個物體上垂直的使力，當此物體在斜坡上，地心引力分成兩個分量•垂直 ( perpendicular ) 和平行地心引力 (parallel )•
我們可以得到以下公式:

Formula

Fg sin 對物體向斜坡下推，而Fg cos向垂直方向推•牛頓的第二定理能各自運用在這兩個方向• 
從這圖形看得出有力正向斜坡下加速•但是並沒有垂直的加速 ; net = maperpendicular =0, and
一定要有一個平衡力 (FN)和他抵消.

　

 Skier on a slope, and a diagram of the forces

　

　
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created by Will Kuo and Stan Watterson
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