### Document

```PAGE 1!
Fancy Title
Name
Date
Class Period
PAGE 2!
• One model of tennis ball launcher has advertis
ed that it is capable of imparting 15,000 J of
kinetic energy to a 0.8 kg ball initially at rest.
• A student carefully measures the compression
of the spring to be 0.20 m.
• What is the elastic energy stored in spring?
• What is the elastic energy stored in spring?
• PE1 + KE1 = PE2 + KE2
• They will be equal!
• KE = 15,000 J
• What is the value of the spring constant for the
tennis ball launcher according to the data
provided?
• Force = F = kx
F = load applied on the spring = mg
m = 0.8 kg
g = 9.8 m/sec^2
• k = spring constant
x = 0.20 m
• What is the value of the spring constant for the
tennis ball launcher according to the data
provided?
• PE = ½ kx2  rearrange for: k = PE / (½ x2 )
• k = 15,000 / (½ 0.20 2 )
• k = 15,000 / (½ 0.04 )
• k = 15,000 / (0.02) = 750,000 N/m
PAGE 3!
• Write a new problem and solve it, using the
same equation as #1 & #4 on the 6 Question
Mini Sheet Assigned yesterday (12/04/14)
PAGE 4!
• Record the IMPORTANT information in
Questions #2 (mountain runners) on this Mini
Book Page
PAGE 5!
• Record the IMPORTANT information in
Questions #3 (roller coaster) on this Mini Book
Page. This information will account for two
PAGE 6!
• Create a new problem and solve using the
equation for Work
PAGE 7!
• Create a new problem and solve using the
equation for Power
PAGE 8!
• Energy can be neither created nor destroyed,
but can change form, for instance chemical
energy can be converted to kinetic energy in
the explosion of a stick of dynamite.
• Provide a new example, with a diagram, of
how energy can change form.
```