gc textbook chapter 8 Rotational Motion (id: f46df9a8f)

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本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 unclassified

[问答题]
If the net force on q 1k4nc 1)urphqc1t a1a system i-6mto6pd:l nu9 ttw/)m+ tnz6p it1a ms zero, is the net torque also zero? If the net torque on a s:tnup 9wlpi)mt1a 6-+t tndo /m t6m6zystem is zero, is the net force zero?

参考答案:

Just because the net force on a system is zero, the net torque need not be zero.  Consider a uniform object with two equal forces on it, and shown in the first diagram.  The net force on the object is zero (it would not start to translate under the action of these forces), but there is a net counterclockwise torque about the center of the rod (it would start to rotate under the action of these forces).

Just because the net torque on a system is zero, the net force need not be zero.  Consider an object with two equal forces on it, as shown in the second diagram.  The net torque on the object is zero (it would not start to rotate under the action of these forces), but there is a net downward force on the rod (it would start to translate under the action of these forces).

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