本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学
[单选题]
A mass is attached to the mirror of a car by a string. As the c 0;zv j zv0qn x31,qv 7ta9hrgxa 1c0;*bfnhy qa:k 0p/ny*qlhr r accelerates to the left n ;anby**q/1yf : 00 krphchql, the string makes an angle with the vertical as shown in the diagram below.
Which of the following shows the correct free-body diagram that represents the forces acting on this mass when it is accelerating?
A.
B.
C.
D.
参考答案: B
本题详细解析:
Explanation:
B is the only diagram that shows weight and tension, with the vertical component of tension equal in magnitude to the weight vector. Upwards and horizontal forces on the mass are only provided by the tension force
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