The first chapter "description of sports" ppt review-Jiangsu course compulsory one courseware

Jiangsu version compulsory one Chapter 1 "Description of sports" ppt review example 1. Which of the following objects can be treated as particles () A. A wooden box placed on the ground, with a horizontal push at the corner of the upper box Push it, the wooden box can rotate B around the lower box angle, the wooden box placed on the ground, push it with a horizontal thrust at the midpoint of its height, the wooden box slides C on the ground, doing figure skating Athlete D. Studying the movement of clock hands is an ideal model, which does not actually exist. If the shape and size of an object are irrelevant or minor factors in the problem studied, the object can be regarded as a particle. All objects in the world can be regarded as particles under certain conditions.

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