题目内容

判断题:

(1)两个长度相等的向量一定相等;

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(2)相等的向量起点必相同;

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(3)平行向量就是共线向量;

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(4)若向量a的模小于b的模,则ab

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(5)质量、动量、功、加速度都是向量;

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(6)共线,则ABCD四点必在一条直线上;

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(7)向量ab平行,则ab的方向相同或相反;

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(8)在△ABC中,

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(9)若向量ab有共同的起点,则以b的终点为起点,以a的终点为终点的向量等于ba

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(10)b0,当a时,则一定有ab共线;

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(11)a·b0,则

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(12)a·ba·c,且a0,则bc

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(13)向量ab方向上的射影是一个模等于(ab的夹角),方向与b相同或相反的向量;

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(14)

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答案:F;F;T;F;F;F;T;T;F;T;F;F;F;T
解析:

(1)F (2)F (3)T (4)F (5)F (6)F (7)T (8)T (9)F (10)T (11)F (12)F (13)F (14)T


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