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Grade 10Modern Physics

In the motion of a simple pendulum(SHM), The component of mg, that means mgsin@ is the force that restores or tends the bob to the mean position(Equilibrium). But I dont understand y it is written as negative. That means, I found in my NCERT Text that F= -mgsin@. And please explain detaily the expression for torque.???

Profile image of Marjaan Mahmood
14 Years agoGrade 10
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2 Answers

Profile image of jaya priya
14 Years ago

SINCE IT IS RESTORING DISPLACEMENT IS REDUCED SO TO INDICATE THAT IT IS DECREASING THEY HAVE PUT -VE SIGN

Profile image of sushant makin
14 Years ago

it  is -fsin@ bcoz of oppositr direction