Q.
In the figure a smooth pulley of negligible weight is suspended by a spring balance. Weights of 1 kg and 5 kg are attached to the opposite ends of a string passing over the pulley and move with acceleration because of gravity. During their motion, the spring balance reads a weight of
A) 6 kg
B) Less than 6 kg
C) More than 6 kg
D) May be more or less than 6 kg
Explanation
(b) Spring balance reading in terms of $\ kgf$
$= \frac{4m_{1}m_{2}}{m_{1} + m_{2}} = \frac{4 \times 5 \times 1}{6} = \frac{10}{3}$
This is less than $6\ kgf$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.