The discussion revolves around a physics problem involving a mass on a frictionless table connected by a string to another mass hanging from a pulley. Participants are exploring concepts related to tension, net forces, and acceleration within this system.
Several participants have offered insights regarding the conditions under which tension may differ and the assumptions about massless components. There is ongoing exploration of the effects of friction and the implications for tension and acceleration.
Participants are considering the effects of assumptions such as the mass of the string and the pulley, as well as the presence of friction in the system. These factors are acknowledged as potentially influencing the outcomes of the problem.
I would word that a little differently. If a section of the string has mass m and acceleration a then the net force on it is ma. If the string is massless then that must be 0.projjal said:If the string is light the net force on it is zero; or else it is accelerating and so there should be some force on it.
Another possibility is that there may be friction in the pulley's axle. (We generally assume there is sufficient friction between the string and pulley to prevent slipping.) This would lead to a difference in tensions even if the pulley is massless.If the pulley is also massless, the tension on both sides will be same.And obviously both the objects will have same acceleration,provided the string is rigid.
Another possibility is that there may be friction in the pulley's axle
haruspex said:Another possibility is that there may be friction in the pulley's axle. (We generally assume there is sufficient friction between the string and pulley to prevent slipping.) This would lead to a difference in tensions even if the pulley is massless.
I do not understand the case when friction is present at the axle and the pulley is massless.
Writing torque equation,(T1-T2)R=Iα .But the R.H.S is zero as I=0.So,T1=T2 .