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c. 490
9. The elevators have different accelerations
Section 7
Physics to Go
1.
a. on paper
b. on paper
2.
a. centripetal force
b. on paper
3. The acceleration becomes greater making ti harder for her to hold onto the key chain
7. Ac= 20^2/200= 2m/s
8.Bottom-Fn, Fg, Fc &Top Fn, Fg,Fc
9. Fc= Fn+Fg
10.
Fast Moving Roller Coaster
Required Centripetal Force
Force of Gravity
Normal Force
Top of Loop
4,000N
500N
3,500
Bottom of Loop
6,000N
Slow-Moving Roller Coaster
Required Centripetal Force
Force of Gravity
Normal Force
Top of Loop
800N
Bottom of Loop
2,800N

equal
Elevator starts moving down
up
smaller
Elevator moves down at constant speed
down
smaller
Elevator comes to rest on bottom floormoves down at constant speed
zero
equal
Elevator comes to rest on bottom floor
up
larger
Elevator is at rest on bottom floor
zero
larger
Elevator moves up at constant speed
up
larger
Elevator comes to rest on top floor
zero
equal
Elevator comes to rest on top floor
down
smaller
Elevator at rest on top floor
zero
7.
a. decrease
b. 31.25415
8.
a.
b. 100490N
b. 590N
c. It will get larger490
9. The elevator is going inelevators have different directions for each situationaccelerations

equal
Elevator starts moving down
up
smaller
Elevator moves down at constant speed
down
smaller
Elevator comes to rest on bottom floor
zero
equal
Elevator is at rest on bottom floor
zero
equal
Elevator begins to move up
up
larger
Elevator comes to rest on top floor
zero
equal
Elevator at rest on top floor
zero
equal
5. The elevator is going down
6. It will go down
7.
a. decrease
b. 31.25
8.
a.
b. 100
c. It will get larger
9. The elevator is going in different directions for each situation

Investigate
On worksheet
Section 6
Physics to Go
1.
a. 19.6
b. 49
c. 98
2.
a. 3.2
b. 8
c. 16
3.
a. No
b. Yes
c. No
4.
Acceleration
Scale Reading
Elevator at rest on top floor
zero
equal
Elevator starts moving down
Elevator moves down at constant speed
Elevator comes to rest on bottom floor
zero
equal
Elevator is at rest on bottom floor
Elevator begins to move up
up
larger
Elevator moves up at constant speed
up
larger
Elevator comes to rest on top floor
Elevator at rest on top floor
zero
equal

ellipses
Investigate
2
a.
b. The greater the distance, the smaller the acceleration
c. 10,000: 3.5
20,000:
30,000:
40,000:
d.On worksheet

celestial force
ellipses
Investigate
2
a.
b. The greater the distance, the smaller the acceleration
c. 10,000: 3.5
20,000:
30,000:
40,000:
d.

Gravity pulls you toward the center of the object
Gravity is pulling them to the center of the earth so they are not upside down
Checking Up
The middle of the room
It is stronger when the lines are closer together
It becomes 1/3^2 or 1/9
celestial force
ellipses

It doesn't affect it, changing the height of where it is dropped from is what changes the speed
The GPE decreases because the height above the ground level is decreasing.
?The KE and GPE have to be equal
It turns into KE
?3/4 of 40,000= 13,333
Section 4
What do you see?
the roller coaster on the moon is not as fun as the one on Jupiter
What do you think?
Gravity pulls you toward the center of the object
Gravity is pulling them to the center of the earth so they are not upside down

Chapter 4
Section 12
Checking Up:
It doesn't affect it, changing the height of where it is dropped from is what changes the speed
The GPE decreases because the height above the ground level is decreasing.
?
It turns into KE
?