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September 3, 2014

Homework Help: physics

Posted by physics on Monday, August 17, 2009 at 8:23pm.

take a satalite going around the earth...

what allows us to say

net force (radial) = Fg = Fr = ma

were the Fg is the force of gravity exerted on the satalite

were Fr is radial force

and ma is the mass and acceleration of the satalite

ok I understand newtons second law but what I don't understand is what allows us to say Fg = Fr

I thought in problems were the force were along the same direction... you added them together to obtain the net force...

i thought the net force would be
Fg + Fr

sense the Fg is points downwards towards the earth and the radial force (sometimes called centripetal) is also pointing along this direction...

this lead me to believe that the net force was

Fg + Fr...

please explain this to me

Thanks!

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