2. Look at the pictures below, how do they relate to energy?

3. Energy is the ability to do work. All activities in the universe, including human activities involve energy changes. What is energy ? Energy is Everywhere

4. How is all energy divided? Potential Energy Kinetic Energy 2 major categories Chemical (E) Stored Mechanical (E) Gravitational Potential (GPE) Electrical (E) Radiant (E) Thermal (E) Sound (E)

5. Potential Energy is energy stored in an object. Ex: Stored chemically in fuel, foods or the winding of a watch. Ex: Stored chemically in fuel, foods or the winding of a watch. Gravitational Potential Energy (GPE) is energy that depends on the position of an object. If height above the ground increases, GPE increases If height above the ground increases, GPE increases If the height above the ground decreases, GPE decreases If the height above the ground decreases, GPE decreases Or stored because of the work done on it: Or stored because of the work done on it: Stretching a rubber band. Stretching a rubber band. Pulling back on a bow’s arrow. Pulling back on a bow’s arrow. Lifting a brick high in the air. Lifting a brick high in the air. Potential & Gravitational potential Energy…

6. Exploring Potential Energy In your head place the objects in order by color from the most potential energy to the least potential energy. Think about gravity and the position…

7. Kinetic energy is an object’s energy due to motion Ex: bouncing a basketball, running a race Ex: bouncing a basketball, running a race The faster an object moves, the more kinetic energy it has. The greater the mass of a moving object, the more kinetic energy it has. Depends on: Mass: Mass: Increase mass, increase KE Increase mass, increase KE Decrease mass, decrease KE Decrease mass, decrease KE Speed: Speed: Increase speed, increase KE Increase speed, increase KE Decrease speed, decrease KE Decrease speed, decrease KE Kinetic Energy…

8. Check for Understanding 100% potential (e) 100% Kinetic (e) Gravitational potential (GPE) 50% Potential (e) 50%Kinetic (e)

9. o Energy due to an object’s motion (kinetic) or position (potential). The bowling ball has mechanical energy. When the ball strikes the pins, mechanical energy is transferred to the pins! What is Mechanical Energy?

10. Objects have mechanical energy if they are in motion and/or if they are at some position relative to a zero potential energy position (for example, a brick held at a vertical position above the ground or zero height position). EXAMPLES: A moving car possesses mechanical energy due to its motion (kinetic energy). A moving baseball possesses mechanical energy due to both its high speed (kinetic energy) and its vertical position above the ground (gravitational potential energy).

11. Energy is continually changing from one form to another in the world These changes are called energy transformations According to the Law of Conservation of Energy, energy cannot be created nor destroyed, only changed from one form to another. Energy Transformations Ex: a car transforms the chemical energy in fuel into useful kinetic energy and thermal energy

12. 100% potential (e) 100% Kinetic (e) Gravitational potential (GPE) 50% Potential (e) 50%Kinetic (e) Law of Conservation of Energy Energy is not created or destroyed, but changes from one form to another.

13. Kinetic-Potential Energy Conversion (a)____________________________ (b)____________________________ (c)____________________________ (d)____________________________ Label each cart based on the energy it has on your notes paper. Example…GPE, Potential, Kinetic..etc

14. A soccer player kicks a ball into the air and it lands far down the field. Which energy conversion occurs as the ball falls from its highest point? A.Kinetic to potential B.Thermal to potential C.Potential to kinetic D.Thermal to kinetic