# Circular Motion and acceleration

Ok, for the circular motion, where we are suppose to have 0 acceleration,
this is the problem i have

My question ask for mass of the washers and paper clips by equating Fc to Fg,

and I am given the # of washers,
and the mass of the stopper.

and the period

now it ask me for mass

how do i find this?
i kno that
Fc = mv^2/r
or
Fc = 4pi^2rm/T^2
and
Fg = mg,
but how do i do it?
i can't seem to figure it out,
even after i figure out the speed, it doesn't help, i have 2 unknowns...The
Fc, and the mass...

Incase this helps, i am swinging the tubber sopper, with a tube, and below the tube is the paper clip to keep my distance so i kno i am swinging at a constant speed, then at the end of string is my washers for the mass.

Last edited:

Doc Al
Mentor
Ok, for the circular motion, where we are suppose to have 0 acceleration,
The centripetal acceleration is certainly not zero!

this is the problem i have

My question ask for mass of the washers and paper clips by equating Fc to Fg,
OK.

and I am given the # of washers,
and the mass of the stopper.

and the period

now it ask me for mass
So you are given the mass of the stopper and you must compute the mass of the washers?

how do i find this?
i kno that
Fc = mv^2/r
or
Fc = 4pi^2rm/T^2
What mass does m stand for here?
and
Fg = mg,
What mass does m stand for here?

Realize that those equations use different masses: one uses the known mass of the stopper; the other uses the unknown mass of the washers.