- #1
allok
- 16
- 0
hello
1.
a) Does object circling around the Earth have angular momentum or linear momentum?
It seems to me that we could use either of the two momentums to describe the system?
b)How about when you rotate a ball on piece of string? Again we could describe the object as having either angular or linear momentum, depending on preference?
c)Could we say that torque is causing the ball to circle with certain acceleration ?
2)
We have rotational kinetic energy and linear one. But why is potential energy only defined as energy that has ability to transform itself into linear kinetic energy? Why doesn't potential energy also include the ability to transform itself into rotational kinetic energy?
Thus we measure the change of potential energy with regards to by how much has the center of mass change its vertical position. But even if object's COM doesn't change its position, it can still rotate a bit due to gravity so work was done ... it would seem reasonable to think of potential energy also as ability for object to rotate due to force of gravity?!
thank you
1.
a) Does object circling around the Earth have angular momentum or linear momentum?
It seems to me that we could use either of the two momentums to describe the system?
b)How about when you rotate a ball on piece of string? Again we could describe the object as having either angular or linear momentum, depending on preference?
c)Could we say that torque is causing the ball to circle with certain acceleration ?
2)
We have rotational kinetic energy and linear one. But why is potential energy only defined as energy that has ability to transform itself into linear kinetic energy? Why doesn't potential energy also include the ability to transform itself into rotational kinetic energy?
Thus we measure the change of potential energy with regards to by how much has the center of mass change its vertical position. But even if object's COM doesn't change its position, it can still rotate a bit due to gravity so work was done ... it would seem reasonable to think of potential energy also as ability for object to rotate due to force of gravity?!
thank you