本题目来源于试卷: gc textbook chapter 2 Kinematics in One Dimension，类别为 IB物理学
[问答题]
Can an object be increasing in speed as its acceleratio +sutd5qv+hq(ll8w3 t4dcdy.n decreases? If il-:,u odoms7so, give an ms o:uo,-i7dlexample. If not, explain.
参考答案: Assume that north
is the positive direction. If a car is
moving south and gaining speed at an increasing rate, then the acceleration
will be getting larger in magnitude.
However, since the acceleration is directed southwards, the acceleration
is negative, and is getting more negative.
That is a decreasing acceleration as the speed increases. Another example would be an object
falling WITH air resistance. As the
object falls, it gains speed, the air resistance increases. As the air resistance increases, the
acceleration of the falling object decreases, and it gains speed less quickly
the longer it falls.
本题详细解析:
暂无
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