- #1
boris16
- 46
- 0
hello
The following is really giving me troubles
*What is needed for an object to circle around the earth?
Let me rephrase this...what conditions need to be met for an Earth's gravity force to act as centripetal force instead of just pulling an object towards its center?
*When you toss a ball horizontally, the first instant the force is perpendicular to the velocity, so its direction changes. But then it's no longer moving horizontally any more, so gravity is no longer perpendicular to the motion: the ball starts speeding up as it falls.
Thing to point out is that while horizontal component of velocity doesn't change in magnitude, it does change its direction at the brief moment when force of gravity was perpendicular to it.
But after that first moment net force(its vertical component) keeps getting bigger as ball is falling towards the earth
If all Earth's mass was gathered at Earth's center, tossed ball would circle around it.
But why is that? Force is no longer perpendicular to velocity vector, or is it?
I need to know exactly what's going on with regards to force of gravity,its direction on ball if all Earth's mass is located at its center
thank you
The following is really giving me troubles
*What is needed for an object to circle around the earth?
Let me rephrase this...what conditions need to be met for an Earth's gravity force to act as centripetal force instead of just pulling an object towards its center?
*When you toss a ball horizontally, the first instant the force is perpendicular to the velocity, so its direction changes. But then it's no longer moving horizontally any more, so gravity is no longer perpendicular to the motion: the ball starts speeding up as it falls.
Thing to point out is that while horizontal component of velocity doesn't change in magnitude, it does change its direction at the brief moment when force of gravity was perpendicular to it.
But after that first moment net force(its vertical component) keeps getting bigger as ball is falling towards the earth
If all Earth's mass was gathered at Earth's center, tossed ball would circle around it.
But why is that? Force is no longer perpendicular to velocity vector, or is it?
I need to know exactly what's going on with regards to force of gravity,its direction on ball if all Earth's mass is located at its center
thank you