The discussion centers around a physics problem involving two masses hanging from a pulley system and the effect of unlocking the pulley on the tension in the strings. The participants explore the differences in tension before and after the pulley is released.
The conversation is active, with participants raising questions about the relationship between the tensions in the strings and the forces at play. Some have provided hints and analogies to clarify the concepts, while others are exploring the implications of different assumptions, such as ignoring friction and the mass of the pulley.
There is a focus on the tension in the strings and the effects of unlocking the pulley, with some participants expressing uncertainty about how to account for various forces and conditions in the problem setup.
Consider the forces acting on each mass and apply Newton's 2nd law. What's different between the "locked" and "free to fall" cases?chaoseverlasting said:How the heck will the tension change? Wont it be the same?
Correct!chaoseverlasting said:That tension is equal to the sum of the tension in the strings attached to the masses. T=2T' where T' is the tension in the string holding the masses.
The tension is uniform throughout the string, but unlocking the pulley makes a huge difference. Remember my example of the rock on a string? If the rock is allowed to fall, the string tension will change. Similarly, if the masses are allowed to fall--by unlocking the pulley--the string tension will change.But T' is a constant. Its one string, and tension in it is uniform. How does it change?