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| 183_notes:l_conservation [2021/05/11 18:57] – [Conservation of Angular Momentum] stumptyl | 183_notes:l_conservation [2021/05/11 19:04] – [Angular Momentum is Conserved] stumptyl | ||
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| ==== Angular Momentum is Conserved ==== | ==== Angular Momentum is Conserved ==== | ||
| - | When a system experiences no net torque about a point, angular momentum is conserved. But, sometimes, there is no location about which a system experiences no net torque; other times, it might be difficult to find that point. Choosing the system appropriately will often ensure there is no external torque on the system. | + | **When a system experiences no net torque about a point, angular momentum is conserved.** But, sometimes, there is no location about which a system experiences no net torque; other times, it might be difficult to find that point. Choosing the system appropriately will often ensure there is no external torque on the system. |
| For example, if the rotation occurs due to the torque exerted by some known object, putting that object into the system removes it from the surroundings. Thus that object is no longer considered to exert a torque on the system (a system cannot exert a torque on itself). The object transfers angular momentum to other parts of the system. This is a good method for dealing with the situations. | For example, if the rotation occurs due to the torque exerted by some known object, putting that object into the system removes it from the surroundings. Thus that object is no longer considered to exert a torque on the system (a system cannot exert a torque on itself). The object transfers angular momentum to other parts of the system. This is a good method for dealing with the situations. | ||