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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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Check
out our YouTube Channel called
Show
Me The Physics
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"What values
would a
bathroom scale
have on
a trip
from the 1st
to the
fifteenth floor?"
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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
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Inertia - Dr. Dave Hall
of Fame
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Unbalanced forces
cause objects to accelerate:
(m)
|
a |
=
|
Fnet |
(N) |
(s2) |
m |
(Kg) |
Fnet =
Resultant
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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
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quartered |
quartered
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"All cars are moving to the
right. Which are speeding up. Which are slowing down?
Which are moving at constant velocity"
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Jan 2006
1 - Speeding up 2 - Slowing Down, 3,4 constant
velocity
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Mass, Acceleration
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Check out this
Video at Georgia Pacific Broadcasting
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