- #1
Vibhor
- 971
- 40
Homework Statement
All pulleys are massless and frictionless and string is massless . Find the acceleration of the two masses and the two pulleys .
Homework Equations
The Attempt at a Solution
I will call the left mass A and right mass B and left pulley P and right pulley R .
Acceleration of B is same as pulley R .
From the string constraint , the relationship between accelerations is ##a_P = a_A+2a_B##
Consider the forces on pulley P . Since it is massless , tension in the string has to be 0 .
Since tension is zero , accelerations of both A and B is ##g## downwards .
Acceleration of pulley P comes out to be ##3g## downwards .
The results look quite strange , especially the acceleration of left pulley .
How is left pulley P accelerating downwards with acceleration greater than g ?
Cam someone point out the mistake .
Many thanks