YumYum247
  • YumYum247
Someone please help me!!!
Physics
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YumYum247
  • YumYum247
Someone please help me!!!
Physics
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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YumYum247
  • YumYum247
A 60 Kg person gets on an elevaator in the Mclennan Physics labs at the university of Toronto. Naturally, there's a scale (measuring Newtons) on the floor, The person steps on the scale and presses "UP". The scale reads 700N (UP). Determine the acceleration of the elevator. Draw a free body diagram.
YumYum247
  • YumYum247
|dw:1442526744201:dw|
YumYum247
  • YumYum247
The natural force pushing down o nthe person is = Fn = 60Kg (9.80m/sec^2) = 588N(Down)

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YumYum247
  • YumYum247
@IrishBoy123 Please help ME!!
YumYum247
  • YumYum247
Fn = 588(down) Fs = 700N (UP) Fs = m.a - m.g Fs = |dw:1442527123799:dw|
YumYum247
  • YumYum247
@Astrophysics HELLP!!! PLEASE!!!
YumYum247
  • YumYum247
am i even remotely close to the right track?
Astrophysics
  • Astrophysics
:3
YumYum247
  • YumYum247
:D
YumYum247
  • YumYum247
true.
Astrophysics
  • Astrophysics
|dw:1442528711236:dw| here's the thing, when the elevator is going up, the acceleration of elevator = acceleration of student
Astrophysics
  • Astrophysics
\[F_{net}=T+W\] so these are the only forces acting on the student
YumYum247
  • YumYum247
his weight and what...T?
Astrophysics
  • Astrophysics
Tension (scale)
YumYum247
  • YumYum247
ok is the tension given to us or nah? no right.
Astrophysics
  • Astrophysics
It is, 700N :)
YumYum247
  • YumYum247
ok....:D
Astrophysics
  • Astrophysics
As the student is rising the scale reads 700N
YumYum247
  • YumYum247
so his acceleration is 700N X 60kg?
Astrophysics
  • Astrophysics
\[ma = T+mg \implies a = \frac{ T+mg }{ m }\]
YumYum247
  • YumYum247
|dw:1442528962628:dw|
Astrophysics
  • Astrophysics
The 60 kg is mass not weight, weight is a force
Astrophysics
  • Astrophysics
W = mg
YumYum247
  • YumYum247
OMG I'm Sorry :(
Astrophysics
  • Astrophysics
xD
YumYum247
  • YumYum247
could you please deinfe Tension for me please!!!
Astrophysics
  • Astrophysics
Tension is the applied force here, which be exerted by pushing or pulling the object, but since the elevator is going up, it is being pulled so that is the applied force here (Tension) which is opposing weight
YumYum247
  • YumYum247
Oh ok cuz i know it by F sub applied, i didn't know it's tension too..
Astrophysics
  • Astrophysics
Applied force = tension, it doesn't matter :P, people often confuse it
Astrophysics
  • Astrophysics
Different notations with same meanings pretty much
YumYum247
  • YumYum247
ok Thanks...just one last thing....could you please name the follow...
YumYum247
  • YumYum247
m.a = ? M.g = ? T = Fapplied
Astrophysics
  • Astrophysics
What do you mean?
YumYum247
  • YumYum247
does net force = m.a right?
Astrophysics
  • Astrophysics
Weight = mg Newton's second law = ma, in the case it's the net force
Astrophysics
  • Astrophysics
F=ma*
Astrophysics
  • Astrophysics
Yes
YumYum247
  • YumYum247
I got it.... Thanks and I LOVE YOU SHOOOOOO MUCH!!!! <3
Astrophysics
  • Astrophysics
By the way, there is a trick question with elevators you may run into
YumYum247
  • YumYum247
please tell me.....:")
Astrophysics
  • Astrophysics
If you ever have a question that says, the elevator is moving up/down what ever at a CONSTANT VELOCITY that implies acceleration = 0
YumYum247
  • YumYum247
OOOOOOOOOooooooooooooooooooooooooooo!!!! Thanks.....:")
Astrophysics
  • Astrophysics
Yw :) teachers often like to trick students with stuff life that, you have to remember your kinetmatics during those questions
YumYum247
  • YumYum247
i've mastered my kinematics!!!
YumYum247
  • YumYum247
:D
YumYum247
  • YumYum247
Anyways plz don't go, i may need your help....thanks :")
Astrophysics
  • Astrophysics
:)
YumYum247
  • YumYum247
OH btw Weight = Normal Force right??????????
Astrophysics
  • Astrophysics
Well...if there is a surface, and then the perpendicular force would be same as weight.
YumYum247
  • YumYum247
ok i'll take that as a yes!!!!!
Astrophysics
  • Astrophysics
|dw:1442529792131:dw|
Astrophysics
  • Astrophysics
But for the elevator, there is no normal force when it's moving
YumYum247
  • YumYum247
ok thanks :")
YumYum247
  • YumYum247
|dw:1442530093066:dw|
YumYum247
  • YumYum247
does it look ok ?????
Astrophysics
  • Astrophysics
Note the direction of the forces
YumYum247
  • YumYum247
the 60kg will cancel out right?????
YumYum247
  • YumYum247
ok sorry!! :)
Astrophysics
  • Astrophysics
\[\vec F _{net}= \vec T + \vec W \implies m \vec a = \vec T +m \vec g \implies \vec a = \frac{ \vec T +m \vec g }{ m }\]
Astrophysics
  • Astrophysics
g = - 9.81 m/s^2
YumYum247
  • YumYum247
oh really?????
YumYum247
  • YumYum247
g = -9.81....ok thanks....but 60kg will cancel out right??????
Astrophysics
  • Astrophysics
Why?
Astrophysics
  • Astrophysics
It can be \[\vec a = \frac{ \vec T }{ m }+ \vec g\]
YumYum247
  • YumYum247
because kg.m/sec^2 = N if i'll have 2N in the numerator and kg in the denominator...
YumYum247
  • YumYum247
ok that still doesn't make things easier to solve :(
YumYum247
  • YumYum247
|dw:1442530594548:dw|
YumYum247
  • YumYum247
|dw:1442530658933:dw|
YumYum247
  • YumYum247
|dw:1442530740704:dw|
YumYum247
  • YumYum247
|dw:1442530801983:dw|
YumYum247
  • YumYum247
i got it!!! :"D
YumYum247
  • YumYum247
@Astrophysics I Love you dear!!!! :") :D
YumYum247
  • YumYum247
Thanks a mol.
Astrophysics
  • Astrophysics
:)

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