2.  How can I model the relationship
between work and energy?
 How can I calculate kinetic energy?

3.  Various uses of the word
energy…

4.  Work causes a change in the energy of
a system
 So work transfers energy between a
system and the external world

5.  Different forms of energy
 Can be changed from one form to another
 When work is done on a system, the energy
of that system increases (pushing
something)
 When the system does the work, the energy
decreases (friction)

6.  If you have a job
 Each time you get
paid, your amount of
money increases
 Positive cash flow

7.  What if you spend
your money?

8.  Energy is the same as money
 Energy can be saved or stored
 Energy can be spent
 When energy is spent, the motion of the
system is changed

9. 

11. 

12.  Worksheet

13.  How do I determine the gravitational
potential energy of a system?
 How do I identify and calculate elastic
potential energy?

14.  Boulder on the top of
a cliff
 How did it get there?
 What if it fell?

15.  An object can have
stored energy due to
its height
 Does the boy or dog
have more stored
energy?

16.  PE = mgy
 m = mass in Kg
 g = 9.8 m/s2
 y = height (m)
 You must start each problem by setting a
reference height (where does y = 0)?

18. You lift a 7.30 kg bowling
ball from the storage rack
and hold it up to your
shoulder. The storage rack
is 0.610 m above the floor
and your shoulder is 1.12 m
above the floor.
a. When the bowling ball is
at your shoulder, what is
the bowling balls
gravitational potential
energy relative to the
floor?

19. b. When the bowling
ball is at your
shoulder, what is the
bowling balls
gravitational potential
energy relative to the
storage rack?
c. How much work was
done by gravity as
you lifted the ball
from the rack to
shoulder level?

20.  Gas is stored chemical energy in a tank
 Compressing a spring, pulling back the
string on a bow, stretched rubber
bands,…
 Elastic Potential Energy

21. 

22.  Page 291, # 4 – 8
 Page 292, # 9, 10, 13