M = m, f highsticks: no motion, f = mg, T = f = Mg
m reached the top of M
Free Body Diagrams
Irodov 1.74
Problem
The mass of the rod M exceeds the mass m of the ball.
The ball has an opening permitting it to slide along the thread with some friction.
The mass of the pulley and the friction in its axle are negligible.
At the initial moment the ball was located opposite the lower end of the rod.
When set free, both bodies began moving with constant accelerations.
Find the friction force between the ball and the thread if t seconds after the beginning of motion the ball got opposite the upper end of the rod.
The rod length equals l.
How to use
Choose a condition (friction) and a frame (Ground / M / m).
Press Play to run. Reset or change a setting to start again.
Use FBD for free-body diagrams. When the ball reaches the top of the rod, T and f appear on the right.
