Ch+4+Sec+9

What do you see? There is more energy involved in a roller coaster then Force. Force is not a major factor in roller coaster. It isn't as easy/relevant to measure force.

What do you think? The turns of the Snake will be most thrilling. Though the speed remands the same, there is a change in direction and a change in direction.

Physics Talk
 * Vectors have both a number and a direction
 * Force is a Vector
 * Displacement is described as a vector
 * To add vectors you must draw them and use vector addition
 * if two directions are perpendicular, vector addition is Pythagorean theorem
 * Scalar has a number but no direction
 * Distance is Scalar
 * Energy is scalar
 * Total energy of a roller coaster is the same at every point
 * GPE depends only on height at one point
 * Force is a Vector

Checking Up 1. Pythagorian Theorem is used to add vector quantitys 2. Energy is a Scalar quantity. Force is a vector. 3. If points are at the same height, where it has the same speed. 4. No, the path of a roller coaster doesn't effect the energy of the roller coaster. 5. A change in the height of a roller coaster will result in the change of GPE which will change the energy of a roller coaster.

PTG 1. a. 7.07 m/s south west from equation below b.

2. These two tracks provide the same change in speed because they have the same initial GPE and final KE. They also have the same height.

3. a. Scalar b. Vector c. Scalar d. Scalar e. Scalar f. Scalar g.Scalar h. Scalar .i Vector

4. a. Scalar b.Scalar c. Scalar d.Vector

5. In terms of Energy: finding speed when in motion

In terms of Force: finding accleration

6. a. b. b. c. Because it is on a straight line

7. a. b. Total Energy is always equal throughout a roller coaster. c. KE at the bottom of a hill is faster then at the top of the hills. The less GPE/height there is, the more KE there is. d. GPE + KE always= total energy

What Do You Think Now? The part of the snake that undergoes the most acceleration will be the most thrilling. The speed can reman the same but the the direction can change resulting in acceleration.