推 yjn145:如果是討論摩擦力作功， 05/25 18:44
→ yjn145:則得要帶對地位移.. 05/25 18:44
[領域] (題目相關領域)
普物
[來源] (課本習題、考古題、參考書...)
考古題
[題目]
A metal plate, mass M and length 2L, is on a table nearly cross to one table
edge. A cubic steel block, mass M and side a (a < L),
is put on the center of the metal plat.
The distance of the center of the steel block from the table edge is d.
Now we apply a force parallel to the table surface to pull the metal
plate out successfully without any block falling to ground.
What is the smallest force we need to apply?
(Assume all the friction coefficients are μ)
[瓶頸] (寫寫自己的想法，方便大家為你解答)
想用外力作功等於摩差力作功
可是又不知道摩差力怎樣考慮
懇請板上高手指點
感謝
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