hce_kmu
111年
物理及化學
第 35 題
A block of mass $2\text{ kg}$ on a table is pushed by a force of $20\text{ N}$ directed with an angle of $30^{\circ}$ downward from the horizontal as shown in the figure. The kinetic frictional coefficient is 0.2. What is the work done by the frictional force after traveling $10\text{ m}$ long? (Gravitational acceleration $g = 10\text{ m/s}^2$)
- A $10\text{ J}$
- B $30\text{ J}$
- C $40\text{ J}$
- D $50\text{ J}$
- E $60\text{ J}$
思路引導 VIP
當你向下斜著推一個放在地上的箱子時，比起單純水平推動，箱子與地面之間的「緊密程度」或「擠壓程度」會發生什麼變化？這種變化又會如何進一步影響箱子受到的滑動阻力呢？