1. 4*9 Force and Energy: Different Insights
WDYS??? (p448) .
WDYT???
_____ and _____ are parts of “The Snake” that would be most thrilling.
If the speed of “The Snake” remains the same, the ride would still be fun because _____.

2. 4*9 Investigate (p448)
Concept Map of Ch4

3. 4*9 Investigate (p448)
6a) Same speed = same height, therefore _____ and _____. 6b) Because they have the same height, they have the same _____ and the same _____. 6c) The largest contact force is at the ________ of the circular loop.

4. 4*9 Investigate (p448)
8. The thrills of a roller coaster comes from __________ NOT going at a constant speed!!!!!!
__________
9a) The carts have the same height, therefore have the same_____ at the top and the same _____ at the bottom.
9b) The cart with the _____ incline will get to the bottom faster.

5. 4*9 Notes Scalars and Vectors
Scalar  a number (size, magnitude) with NO direction
EXAMPLE speed, distance, energy
Vector  a number (size, magnitude) AND direction
EXAMPLE velocity, displacement, force

6. 4*9 Notes 2. Adding Scalars and Vectors
Scalar  Just add them—no biggie 
Vector  Vector diagrams and math…..
Vectors in the same direction—add
In opposite directions –add the negative (subtract)
At right angles—Pythagorean Theorem

7. 4*9 Notes
Vector Addition EXAMPLES: add the following vectors: (vector diagrams and math)
a. 20 m/s north and 30m/s north
b. 30 N Left and 40 N right
c. 6 m/s/s left, and 8m/s/s up.

8. 4. Energy – A Scalar Quantity
All energies are measured in joules
At whatever point on the roller coaster, the total ME (=GPE+KE) is always the same due to the law of conservation of energy
If two points on a roller coaster have the same height, then they have the same velocity, KE and GPE.

9. The ENERGY at any given point on the ride
In roller-coaster physics, ENERGY can tell you 3 things:
The ENERGY at any given point on the ride
GPE is dependent on height and GPE is GOLDEN!!!
If any 2 points on the ride have the same height, then they will have the same speed, GPE, and KE 

10. 5. Force – A Vector Quantity (p453)
Force and Weight are measured in NEWTONS.
On a straight incline, the FGravity and the FNormal always remain in fixed directions 
you are constantly speeding up
you are constantly going in the same direction
On a curved incline, the Fnormal is always changing direction and speed 
your speed is constantly changing (up, down, up, down)
your direction is constantly changing (up, down, up, down)

11. A Roller-Coaster is an Energy Ride!?!?!?
When to Consider Force and When to Consider Energy
A Roller-Coaster is an Energy Ride!?!?!?
If you are looking for the SPEED of the ride, then it is easier to find the HEIGHT  GPE  KE
A Roller-Coaster is a Force Ride!?!?!??
If you are looking for the acting forces (apparent weight), then it is easier to make a Free-Body Diagram (FBD)

12. 4*9 TOTD 1.