题目
题目

UCIC 202503 PHYS101 Quiz 3

单项选择题

When is the work negative?

选项
A.a. When the projection of the force is in the opposite direction to the displacement
B.b. When the projection of the force is in the same direction as the displacement
C.c. When the projection of the force is smaller than the displacement
D.d. When the projection of the force is in the perpendicular direction to the displacement
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标准答案
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思路分析
To determine when work is negative, we examine the definition of work in physics: work done by a force F along a displacement s is W = F · s = |F| |s| cos(theta), where theta is the angle between the force and displacement vectors. Option a: 'When the proje......Login to view full explanation

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