- #1
Dweirdo
- 174
- 0
HI,
I have a stupid question but important, Newton;s first law doesn't mention anything about Net force , just that a body that no external forces acts in him, will stay @ rest or with constant velocity ,now my problem is the word "rest",
Is a body at rest relative to something Is a body that relative to that thing has zero velocity? or body at rest means that there are no forces on him + relative velocity=0?
or no net force acts on him+relative velocity =0?
Like ,which conditions satisfy the word "Rest".
Let's say a body is thrown vertically , and at the top height it's relative velocity(according to me as an observer) =0 , can I say that this is a position that the body is @ rest? or it's false cause there is net force on him, I know that this period of relative velocity=0 is small, but in the moment cau I say the body is at rest?
to cut a long story short:
Does rest mean:
1)Rest in peace, aka no net force + relative velocity=0.
2)Rest in your couch, not moving just changing TV-channels ,aka just relative velocity=0?
thank You,
Dw
I have a stupid question but important, Newton;s first law doesn't mention anything about Net force , just that a body that no external forces acts in him, will stay @ rest or with constant velocity ,now my problem is the word "rest",
Is a body at rest relative to something Is a body that relative to that thing has zero velocity? or body at rest means that there are no forces on him + relative velocity=0?
or no net force acts on him+relative velocity =0?
Like ,which conditions satisfy the word "Rest".
Let's say a body is thrown vertically , and at the top height it's relative velocity(according to me as an observer) =0 , can I say that this is a position that the body is @ rest? or it's false cause there is net force on him, I know that this period of relative velocity=0 is small, but in the moment cau I say the body is at rest?
to cut a long story short:
Does rest mean:
1)Rest in peace, aka no net force + relative velocity=0.
2)Rest in your couch, not moving just changing TV-channels ,aka just relative velocity=0?
thank You,
Dw