- #1
MakeItThrough
- 13
- 0
Why do the centripetal and gravitational force equal each other in orbit??Also...
Say for example, a problem wants us to find the mass of a planet. It gives us a satellite that orbits that planet with a radius of R and a period T. Now, I know how to solve this problem. You must set Fc = Fg.
But what I do not know is why the centripetal and gravitational force of these two objects must equal each other.
Also, a similar problem to that is one like this:
When you take your 1200 kg car out for a spin, you go around a corner of radius 57.6 m with a speed of 15.2 m/s. The coefficient of static friction between the car and the road is 0.84. Assuming your car doesn't skid, what is the force exerted on it by static friction?
Again, I already know how to solve this. You must set Fc = Ff ... mv^2 / r = Ff, and then you just plug in the given values into the mv^2 / r and that is your answer.
I do not know why in this case the centripetal force and the static friction must equal each other.
If someone could please explain this to me, I would feel so much better while taking the test tomorrow... My teacher goes through this stuff extremely fast.
V = 2piR / T
Fc = mv^2 / r
Fg = Gm1m2 / r^2
Homework Statement
Say for example, a problem wants us to find the mass of a planet. It gives us a satellite that orbits that planet with a radius of R and a period T. Now, I know how to solve this problem. You must set Fc = Fg.
But what I do not know is why the centripetal and gravitational force of these two objects must equal each other.
Also, a similar problem to that is one like this:
When you take your 1200 kg car out for a spin, you go around a corner of radius 57.6 m with a speed of 15.2 m/s. The coefficient of static friction between the car and the road is 0.84. Assuming your car doesn't skid, what is the force exerted on it by static friction?
Again, I already know how to solve this. You must set Fc = Ff ... mv^2 / r = Ff, and then you just plug in the given values into the mv^2 / r and that is your answer.
I do not know why in this case the centripetal force and the static friction must equal each other.
If someone could please explain this to me, I would feel so much better while taking the test tomorrow... My teacher goes through this stuff extremely fast.
Homework Equations
V = 2piR / T
Fc = mv^2 / r
Fg = Gm1m2 / r^2