# Mass, weight, acceleration, motion

## Main Question or Discussion Point

Hi,

I am confused with the basic blocks. These are meant to be known the way we know alphabets but I am not able to. I was just reading this fat physics book Serway Jewett but things are confusing

1. Mass is inversly proportional to acceleration, Ok i agreed then the book speaks about gravity acceleration still here things are cool understood then the author says the acceleration(gravity) is maximum at the center of the earth and tends to decrease as it moves away ok....and he says the weight as well decreases WHY? Author said mass and acceleration are inversly proportional...and it also says weight is directly proportional to mass...I can visualise what he is saying and tends to be right but with equations na not understanding I feel as if i'm tangled with this. Someone entangle me out of this mystery. And also i would like to know the relation between the linear motion and rotary motion.

Kindly help me through this I would be very greatful

Thank you.