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  • An atwood machine has masses 5Kg and 15 Kg as shown What is the acceleration at 15 Kg mass when system is released from rest An atwoo

An atwood machine has masses 5Kg and 15 Kg as shown What is the acceleration at 15 Kg mass when system is released from rest An atwoo

Answers (1)

TAKE BOTH MASSES AS ONE  SYSTEM ,SO THAT TENSION IN THE STRING WILL NOT BE COUNTED.

WE HAVE TO FIND ACCELERATION OF 15 Kg MASS ,

Fnet=(Mnet)*(Anet)

Fnet= total force on system

Mnet=  total mass of system

Anet= acceleration of system

Fnet=15 * 10 - 5 + 10 = 100 N     (AS BOTH FORCES ARE IN THE OPPOSITE DIRECTION ,THAT IS WHY WE ARE SUSTRACTING BOTH FORCES.)

Mnet=5 + 15 = 20 Kg

Anet = 100 / 20 = 5 meter per second square.

 

TRICK :

BUT WE CAN USE DIRECT FORMULA IN ATWOOD MACHINE QUESTION

Tnet = tension in string = \frac{2m1m2}{m1+m2}g

Anet = \frac{m_2-m_1}{m_1+m_2}g

 

Posted by

arun shelke

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