美國物理競賽F=ma真題開放中！

一年一度由美國物理教師協(xié)會（AAPT）舉辦的F=ma學術(shù)活動開始報名啦，該學術(shù)活動也是美國選拔高中物理奧林匹克隊伍的初賽，有些像大家已經(jīng)熟悉的數(shù)學AMC。

• 2022 年 1 月 21 日 –?F=ma 注冊截止日期

• 2022 年 2 月 9 日 -?F=ma 考試 A

• 2022 年 2 月 15 日 –?F=ma 考試 B

• 2022 年 6 月上旬 -馬里蘭大學美國物理隊訓(xùn)練營

部分試題：

F=ma試題的難度在AP Physics C Mechanics之上，但并不需要微積分基礎(chǔ)。同學們可以在學習AP Physics C Mechanics的基礎(chǔ)上，通過做往年的題目進行能力提升和查漏補缺。

1.A point mass m is glued inside a massless hollow rod of length I at an unknown location. When the rod is pivoted at one end, the period of small oscillations is T. When the rod is pivoted at the other end, the period of small oscillations is 27. How far is the mass from the center?

(A)L/8

(B)L/6

(C)L/4

(D)3L/10

(E)2L/5

2.A lballerina with moment of inertia I is quickly twirling with angular velocity e. In her hand she has a pen of mass m at a radius R from her axis of rotation. The ballerina releases the pen. Afterward, what happens to the vertical component of the angular momentum of the system consisting of the ballerina and the pen? You may ignore all friction, but not gravity or normal forces.

(A) It decreases until the pen hits the floor.

(B) It increases until the pen hits the floor.

(C) It always stays the same.

(D) It initially stays the same, but decreases when the pen hits the floor.(E) It initially stays the same, but increases when the pen hits the floor.

3. During this process, the block has been raised by approximately a height

(A)0.15L

(B)0.23L

(C)0.31L

(D)0.37L(E)0.40L

因文章篇幅過長，需要的同學可以掃碼【免費領(lǐng)取】歷年真題及解析~