1. BELLWORK 2/01/17
From the work-kinetic energy theorem, we see that the speed of an object ______ if the net work done on it positive, because the final kinetic energy is greater than the initial kinetic energy.

2. ANSWER
Increases

3. Potential Energy

4. How is all energy divided?
Potential
Energy
Kinetic
Energy
Gravitation
Potential
Energy
Elastic
Chemical

5. What is Potential Energy?
Energy that is stored and waiting to be used later

6. What is Gravitational Potential Energy?
Potential energy due to an object’s position
P.E. = mass x
height x gravity

7. Gravitational Potential Energy
PEg = mgh
Measured in Joules
Height is measured from an arbitrary zero level.
If an egg falls from the table to the floor, then the floor is the zero level.
If a person jumps from the 2nd level to the 1st level, then the 1st level is the zero.

8. What is Elastic Potential Energy?
Potential energy due to compression or expansion of an elastic object.
Notice the ball compressing
and expanding

9. Elastic Potential Energy
When an external force compresses or stretches the spring, elastic potential energy is stored in the spring.
The amount of energy depends on the distance the spring is stretched or compressed.
PEelastic = 1/2kx2
K = spring constant or Force Constant
The spring constant will be given to you and is measured in units of N/m
X= distance stretched or compressed

10. What is Chemical Potential Energy?
Potential energy stored within the chemical bonds of an object

11. ASSIGNMENT Read Pages 169-170 Page 172 - Practice D - #1 and 2
Page 172 (Section Review) #’s 1- 3