Umakant biswal
Last Activity: 8 Years ago
@ tarun
ideally speaking there is no shrtcut for pulley problem technique .
but u can infer from the following points .
i am giving you some tricks to solve the problems in laws of motion kindly follow that
1- always draw fbd of individual bodies given in the system , (blocks , pulley etc )
2- when u have to show direction of tension forces in contact with fbd of a body then always use the concept – TENSION ALWAYS ACT AWAY FROM BODY .
3- MAKE THE RIGHT SENSE IN YOUR MIND THAT IN WHAT DIRECTION THE BODY WILL MOVE
4- NOW MAKE EQUATION ACC TO MOTION OF BODY
trick – for making equation in the fbd , always take those contact forces as +ve sign which are along the sense of motion , and take those as -ve which are opposite to the sense of motion ,
imp points
1- spring balance read the tension in the string
2- if string is inextensible and all pulley are fixed , then magnitude of all masses connected through string is same .
3- in case of movable pulley , the acceleration of all masses are diffrent , in order to get relation between their acceleration we use the TENSION TRICK .
TENSION TRICKS ARE A THE VERY SHORT WAY TO APPROACH THE PROBLEMS , but remember concept of movable pulley are very imp . for jee advanced and mains exam .
SO, PRACTICE FEW QUESTIONS FROM D C PANDEY MECHANICS BOOK AND TAKE H C VERMA FOR CONCEPT , U WILL GET FAMILIER WITH IT AUTOMETICALLY
ALL THE BEST ..