Maximum static friction coefficient so the string won't break. скачать в хорошем качестве

Maximum static friction coefficient so the string won't break.

We compute the maximum static friction coefficient so the string won't break when we attempt to pull a block under another block. 🧠 Access full flipped physics courses with video lectures and examples at https://www.zakslabphysics.com/ We start with a discussion of the physical intuition of the problem: as we pull harder on the lower block, it will exert a larger static friction force on the top block pulling to the left. As we pull harder, the tension in the string increases, and we want the static friction force to max out before the string breaks at the given value of breaking strength. So the problem is entirely static, and the static friction force pulling to the left on the block is equal to the tension pulling right on the block. We want the static friction force at its maximum value as the tension in the string equals its maximum value, so we can plug in our formula for maximum static friction in terms of normal force and static friction coefficient. Now we have to compute the normal force on the block, which is equal to the weight in this case because there are no other vertical forces in the problem. Setting the maximum static friction force equal to the maximum tension in the string, we arrive at the maximum coefficient of static friction so the string won't break.