1. WARM UP
What is Energy ?

2. Energy ENERGY The ability to cause change. THERMAL Potential NUCLEAR
internal motion of particles
ENERGY
Potential
Stored energy
NUCLEAR
Kinetic
changes in the nucleus
ELECTRICAL
motion of objects
CHEMICAL
joules (J)
motion of electric charges
bonding of atoms

3. Energy and Work Energy Work Conservation of Energy

4. What is energy
Wherever you are sitting as you read this, changes are taking place
What changes are happening ?

5. Change Requires Energy
When something is able to change its environment or itself, it has ……...
Energy is ……… .

6. Different Forms of Energy
Energy has several different forms .
Is the chemical energy stored in food the same as the energy that comes from the Sun or the energy stored in gasoline?

7. Different Forms of Energy
Radiant energy from the Sun travels a vast distance through space to Earth
What happens to that energy next?

8. An Energy Analogy
If you have $100, you could store it in a variety of forms. What are they? .
You could transfer that money to different forms

9. An Energy Analogy Regardless of its form, money is …….
The same is true for energy.
Energy from the Sun that warms you and energy from the food that you eat are only different forms of the same thing.

10. Energy Kinetic Energy (KE) Which has the most KE? .
80 km/h
50 km/h
Which has the most KE?
Which has the least KE? . .

11. Kinetic Energy (KE) The SI unit of energy is the …..
The formula is …..

12. Potential Energy .

13. Energy Potential Energy (PE) .
Which boulder has greater gravitational PE?
What other ways can an object store energy?

14. Elastic Potential Energy.
Where did this kinetic energy come from?
Elastic potential energy is …..

15. Chemical Potential Energy
Gasoline stores energy in the same way as food stores energy: in the chemical bonds between atoms.
Energy stored in chemical bonds is chemical potential energy.
Energy is stored in the bonds that hold the carbon and hydrogen atoms together and is released when the gas is burned.
In this chemical reaction, chemical potential energy is released.

16. Gravitational Potential Energy
Anything that can fall has stored energy called gravitational potential energy.
Gravitational potential energy (GPE) is energy stored by objects due to their position above Earth’s surface.
Gravitational potential energy can be calculated from the following equation.
On Earth the acceleration of gravity is …….. m/s2, and has the symbol …….

18. Changing GPE
According to the equation for gravitational potential energy, the GPE of an object can be increased by ……..
If two objects are at the same height, then the object with the larger mass has ……..

19. GPE GIVEN: m = h = g = m/s2 GPE = ?
A 3kg crow is perched on a tree limb 20m above the ground. What is the crow’s GPE
GIVEN:
m =
h =
g = m/s2
GPE = ?
WORK:
GPE =

20. V2 KE Kinetic Energy ½ M GIVEN: m = v = KE = ?
The crow (the same as above) starts to chase a hawk and flies at a velocity of 6m/s what is his Kinetic Energy
GIVEN:
m =
v =
KE = ?
WORK:
KE =
½ M KE V2