Transcript Elevators!

Elevators!
• Normal!
Back
Normal!
Goingto
Coming
Up!
to Rest!
Weight never
Gravity
never
– Normal
Force
& Normal
&
changes!!!!!!
changes!!!!
Force areare
Gravity
– balanced!
The
Now,
floor
the -Floor
just
balanced
again!
pushes
up
push
harder
– doesn’t
Total Force
isas
than weight
much
as weight
pulls
zero, FFTot
==00N
N
Tot
– down
Total Force is
–
is is
– Velocity
Total Force
Negative
constant
– ZERO!
again!
Positive
FTot = F + FG
– Velocity is
FTot
=
+ FG
decreasing
N
N
F
– Velocity is
increasing
Elevators!
• Normal!
– Gravity & Normal
Force are
balanced!
– Total Force is
zero, FTot = 0 N
– Velocity is
constant – ZERO!