The Work of a Normal Force
The Work of a Normal Force作者机构：Department of Mathematics and Physics University of Wisconsin-Parkside Kenosha WI USA
出 版 物：《Journal of Applied Mathematics and Physics》 (应用数学与应用物理（英文）)
年 卷 期：2017年第5卷第5期
页 面：1113-1119页
学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学]
主 题：Work Normal Force Kinetic Energy Speed
摘 要：It is shown that an impulsive force acting on a particle perpendicular to its velocity vector cannot change its direction of motion without increasing its kinetic energy. If the particle’s kinetic energy is to remain unchanged, the impulsive force must have a component in the direction opposite to the direction of motion. This situation is also realized in the case of a continuous force acting perpendicular to the velocity vector of the particle, when the particle s motion is viewed as a sequence of infinitesimal steps.
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