力学 模块测试选题 .pdf

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When a mass point is in a circular motion then (A) The tangential acceleration definitely change, the normal acceleration also change. (B) The tangential acceleration may not change, the normal acceleration definitely change.

(C) The tangential acceleration may not change,

the normal acceleration does not change.

(D) The tangential acceleration definitely change,

the normal acceleration also change. How many of the following statements will be true?

(1) The acceleration of a mass point making a circular

motion points to the center of the circle. (2) The acceleration of a mass point making a constant speed circular motion is a constant. (3) A motion with only normal acceleration must be a circular motion . (4) A motion with only tangential acceleration must be linear motion. (A) 0 (B) 1 (C)

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