A uniform meter stick of mass is suspended so that it remains at rest in a horizontal…
PHYSICS · Multi-part · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A uniform meter stick of mass 0.20kg is suspended so that it remains at rest in a horizontal position when a 0.50kg mass is hung from the 10 cm mark and a supporting string is attached somewhere along the stick. The string exerts only a vertical force on the stick.
Assume the system is in static equilibrium in Earth’s gravitational field.
(1) Describe all the forces that act on the meter stick and state the point along the stick at which each force can be considered to act.
(2) Explain whether the requirement for rotational equilibrium must be satisfied only about the point where the string is attached or about every possible axis. Support your answer with reasoning based on Newton’s laws.
(3) Without performing any numerical calculations, discuss which single choice of axis would make it simplest to determine the unknown force exerted by the string and justify why that choice is advantageous.