Question

A monkey of mass $m$ kg slides down a light rope attached to a fixed spring balance, with an acceleration $a$. The reading of the balance is $w kg [g=$ acceleration due to gravity $]$

• A. $m=\frac{w g}{g-a}$
• B. $m=w\left(1+\frac{a}{g}\right)$
• C. the force of friction exerted by the rope on the monkey is $m(g-a)N$
• D. the tension in the rope is $wg\,N$

Answer 1

Answer: (C)

the force of friction exerted by the rope on the monkey is $m(g-a)N$

Answer 2

The reading of the spring balance $=$ tension in the rope $=$ the force of friction between rope and the monkey $=m g-m a=m(g-a) N$