hce_kmu
110年
物理及化學
第 33 題
The string and the pulley are massless, and the coefficient of static and kinetic frictions are $0.2$ and $0.1$, respectively, for both table 1 (T1) and 2 (T2). If $m_1 = 2\text{ kg}$, $m_2 = 3\text{ kg}$, and $m = 1.5\text{ kg}$, find the acceleration of m. (Gravitational acceleration $g = 10\text{ m/s}^2$)
- A $7.7\text{ m}^2\text{/s}$
- B $8.7\text{ m}^2\text{/s}$
- C $9.7\text{ m}^2\text{/s}$
- D $10.7\text{ m}^2\text{/s}$
- E $11.7\text{ m}^2\text{/s}$
思路引導 VIP
想像一下,如果我們把這兩個放在桌上的積木 $m_1$ 和 $m_2$ 換成非常重、甚至焊死在桌上的鐵塊,中間掛著的物體 $m$ 還能掉下去嗎?那麼,現在它們會滑動,是誰在後方拼命「拉住」它們不讓它們跟著 $m$ 一起衝下去呢?