1. ENERGY

2. Energy The ability to do work or cause change.
Has different forms (position, motion, heat)
Can travel in different ways (light, sound, electricity)

3. Kinetic Energy Energy that comes from motion A spinning bicycle wheel
Sprinting runners
ANYTHING moving!

4. Kinetic Energy Ek = 1 mv2 2 May also see it as KE
To solve these problems you MUST square velocity first – order of operations!!!
Mass (kg)
Ek = 1 mv2 2
Speed (m/sec)
Kinetic Energy
(joules)
KE Video

5. Example Problem
What is the kinetic energy of a jogger with a mass of 65.0 kg traveling at a speed of 2.5 m/s?

6. Potential Energy Stored energy that comes from position
A drawn bow (elastic PE)
A book on the top shelf (gravitational PE)
A stretch rubber band

7. Potential Energy Ep = mgh Depends on the position above the ground
The greater the height, the greater the PE
Formulas:
GPE = weight x height
EP =mgh
Mass (kg)
Potential Energy
(joules)
Ep = mgh
Height (m)
Acceleration
of gravity (m/sec2)
PE Video

8. Example Problem
Find the gravitational potential energy of a light that has a mass of 13.0 kg and is 4.8 m above the ground.

9. Roadrunner Examples of KE and PE
Videos
KE and PE Song
Roadrunner Examples of KE and PE

10. Law of Conservation of Energy
Energy can change from one form to another but it can never be created or destroyed under ordinary conditions

11. Law of Conservation of Energy
More Videos
Law of Conservation of Energy
Types of Energy