New answers tagged

0

In a massless string the sum of forces acting on every part of the string must be zero, otherwise, if the force was finite, the string would get an infinite accelleration $a = \lim_{m\rightarrow 0} F/m = \infty$. (The more physical way to say it is that if the mass is very small the force must be very small for finite accelerations). So in frictionless and ...


0

I'm not sure exactly what you are confused about, but I can try to answer some general points regarding problems like these. Massless strings are not possible. They are introduced in problems like these in order to simplify calculations and solutions (You no longer have to worry about the mass of the string when analyzing forces). Real physical systems don't ...



Top 50 recent answers are included