- #1
Shing
- 144
- 1
Hi guys, I am self-studying physics, but I am confused for something following:
given 1-d motion of an object o, we can use these equations to describe the motion of it.
[itex]\overline{v}[/itex] is a constant, so is[itex]\overline{a}[/itex] .
1)[tex]x_t=x_0+\overline{v}t[/tex]
2)[tex]v_t=v_0+\overline{a}t[/tex]
3)[tex]d(x_t,x_o)=v_ot+\frac{1}{2}\overline{a}t^2[/tex]
if we take an rest reference frame of o
then how will those equations be changed?
here is how I think:
in case I,
there is no acceleration,
[tex]x_t=x_0+\overline{v}t=x_0[/tex] if [itex]v_0=\overline{v}[/itex]
question 1. what if[itex]v_0>\overline{v}[/itex]? and [itex]v_0<\overline{v}[/itex]
should it be written as: [itex]x_t=x_o+|\overline{v}-v_r|t[/itex]??
in case II,
there is acceleration,
I am really confused by this case,
since the textbook told me there is no relative motion when it comes to acceleration. And I have no idea WHY.
and after reading Newton's bucket, I am even more confused.
I have no idea how I should write the two equations 2)&3)
question 2.the acceleration seems to be changed... but how?
thanks for your reading, please help me =)
given 1-d motion of an object o, we can use these equations to describe the motion of it.
[itex]\overline{v}[/itex] is a constant, so is[itex]\overline{a}[/itex] .
1)[tex]x_t=x_0+\overline{v}t[/tex]
2)[tex]v_t=v_0+\overline{a}t[/tex]
3)[tex]d(x_t,x_o)=v_ot+\frac{1}{2}\overline{a}t^2[/tex]
if we take an rest reference frame of o
then how will those equations be changed?
here is how I think:
in case I,
there is no acceleration,
[tex]x_t=x_0+\overline{v}t=x_0[/tex] if [itex]v_0=\overline{v}[/itex]
question 1. what if[itex]v_0>\overline{v}[/itex]? and [itex]v_0<\overline{v}[/itex]
should it be written as: [itex]x_t=x_o+|\overline{v}-v_r|t[/itex]??
in case II,
there is acceleration,
I am really confused by this case,
since the textbook told me there is no relative motion when it comes to acceleration. And I have no idea WHY.
and after reading Newton's bucket, I am even more confused.
I have no idea how I should write the two equations 2)&3)
question 2.the acceleration seems to be changed... but how?
thanks for your reading, please help me =)