gc textbook chapter 8 Rotational Motion (id: f46df9a8f)

[问答题]
If the net force on a sqrw92zys hbr,5gi j-rlz5 4t+ ystem is0lzaxdh88k9ijdg7siam8 cv99-*d co zero, is the net torque also zero? If the net torque on a system is xc7d8g80s* c9 lza 9d-dmh 9iav8joikzero, 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).

本题详细解析: 暂无