DaRReN
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DaRReN 發問於 科學及數學其他 - 科學 · 1 十年前

# friction磨擦力的

### 2 個解答

• 1 十年前
最愛解答

By Cold-Welding Theory:

When two bodies are in contact, its real area in contact, A&#39;, is much less than its apparent area, A. Pressures at the points of contact are extremely high and cause the humps to flatten out until the increased area of contact enables the upper solid to be supported. It is thought that at the points of contact, small, cold welded joints are formed by adhesive forces between molecules which are very close together. These bonds have to be broken and accounts for the frictional force, f, whenthere is relative motion.

簡單來說即是因為物件表面非常粗糙,

真正的接觸面其實少得極, (試幻想只是山頂與山頂相接而已)

所以在這些真正接觸面上的分子會因為巨大的力而產生結合鏈,

而它的特性就是磨擦力的方向是與壓著物件的力的方向成直角的.

但又成正比例的.

資料來源： 我個腦+書
• 1 十年前

只要有2樣野就會有friction..

When an object moves over a surface, there is usually a force opposing its motion.

This force is called friction. In gerenal, friction slows down moving objects.

Friction acts onthe contacting surfaces of two objects when they move over each other. Friction always opposes the motion of an object.

我諗你系高FORM吧-.-

我只系中2..

我系自己本IS書度打出黎的..

希望幫到你..