Why would your "weight"
change
3 times in an elevator trip?
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
2nd Law - Relationship between F, m, a
Inertia - Dr. Dave Hall of Fame
Unbalanced forces
cause objects to accelerate:
| (m) | a | = | Fnet | (N) |
| (s2) | m | (Kg) |
Fnet = 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 |
Which cart is slowing down as it travels to the right?
Choice 2
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