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A man walks into an elevator and steps on a bathroom scale. The
scale reads 155 lbs.
The door clase and the elevator accelerates upward. The moment
the elevator accelerates the scale shows a reading:
a) less than 155 lbs
b) greater than 155 lbs
c) equal to 155 lbs

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out our YouTube Channel called
Show
Me The Physics

"What values
would a
bathroom scale
have on
a trip
from the 1st
to the
fifteenth floor?"

Imagine a person weighs 600. N
Start
 Scale reading goes up
(greater than 600. N) Inertia
(Object rest tends to stay at rest)
Most of trip up:
(W = 600. N) Constant velocity
Net force = 0
Slow Down and Stop
 (Scale reading less than 600. N)
Object in motion tends to stay in motion
Is this elevator going up or down?
The elevator was going down.
2nd Law
 Relationship between F, m, a
Inertia  Dr. Dave Hall
of Fame
Unbalanced forces
cause objects to accelerate:
(m)

a 
=

F_{net} 
(N) 
(s^{2}) 
m 
(Kg) 
F_{net} =
Resultant
1. Acceleration
is directly proportional to the force exerted on
an object
a 
F 
x 3 
x 3

x 2 
x 2

divided by 3 
divided by 3

divided by 2 
divided by 2

x 2/3 
x 2/3

quartered 
quartered


"All cars are moving to the
right. Which are speeding up. Which are slowing down?
Which are moving at constant velocity"

Jan 2006
1  Speeding up 2  Slowing Down, 3,4 constant
velocity
Mass, Acceleration
Check out this
Video at Georgia Pacific Broadcasting
©Tony Mangiacapre.,  All Rights Reserved
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