如果你未學好好DSE野,就唔好學d out-C野住。
一般而言,friction oppose the motion。
詳細d講,friction opposes the tendency of change of motion between two contacting surfaces。
如果無friction,the object tends to move on a straight line,相對嗰center就會向外(意思係遠離左嗰center),所以friction 向住center
一般,老師/出面教嘅方法,
The object undergoes a circular motion.
There must be a net force (centripetal force) towards center. Since the friction is the only force parallel to the table, it must be towards center
但咁解釋其實係倒果為因,知道左結果,先判斷嗰因,但如果你上面解釋唔明,就用呢個黎解釋
勿理人2018-04-05 23:17:47
MC有用
LQ要寫Steps,但你計算過程可以飛Steps
I大世界第一2018-04-05 23:29:32
I大世界第一2018-04-05 23:31:16
連登仔個個青大n展
呢d咁簡單邊會難到佢地
勿理人2018-04-06 13:31:20
YL 物理Physics Miss Wong
勿理人2018-04-06 13:32:24
有諗過拍晒所有DSE past paper解題,下年會做
必歐-沙伐2018-04-06 14:06:26
Current Divider
Voltmeter 有infinite resistance, 如果R2 open, 所有電流流向Ammeter