This document contains information about a roller coaster problem and energy transfers in various systems. It begins by stating that the weight (Wt) of the roller coaster is 50N. It then lists 7 problems about finding different forms of energy (potential, kinetic, mechanical) at various points (A, B, C) in the roller coaster's path. The document also discusses energy transfers that occur in systems like light bulbs, the human body during digestion, and hairdryers. It defines and provides examples of different forms of energy, such as mechanical, electrical, nuclear, chemical, sound, light, and thermal energy.

1. Wt=50N
1. What is the KE at point A? Why?
2. What is the PE at point A?
3. What is the ME at point A?
4. What is the height at point B?
5. What is the height at point C?

2. 1. What is heat?
2. How does thermal energy play
a role in the Law of
Conservation of Energy?

3. Roller Coaster Energy Problems
HT=250 m
WT=200N
HT=20 m
WT=200N
M=20kg
V=200m/s
1. Find the PE at point A.
2. Find the KE at point A. Answer the
3. Find the ME at point A. problems on
4. Find the KE at point B. the left on your
sheet under the
5. What is the ME at point C? roller coaster
6. Find the PE at point C. picture.
7. Find the KE at point C.

4. 1. Describe the energy transfers
that occur in a light bulb.
2. Describe the energy transfers
that occur when the body is
powered by food.

5. 1. Describe the energy transfers
in a hairdryer.
2. What is the difference
between renewable and
nonrenewable energy
resources?

6. Forms Explanation Example
Total energy of
Mechanical
motion and position
Total kinetic energy
Thermal
of particles
Energy stored in
Chemical
rearranging atoms

7. Energy of moving
Electrical
electrons
Energy of vibrating
Sound
particles
Vibrations of electrically
Light
charged particles
Energy in the nucleus of
Nuclear
an atom

8. 1. Mechanical Energy
total energy of motion and position
ME=KE + PE

9. 2. Electrical Energy
the energy of moving electrons
Like charges repel and
+ +
Opposite charges attract
+ -

10. The Power of Electricity
 Can be turned into other kinds of energy
 Can do work
 Hairdryer converts electric to thermal
 Alarm clock converts electric to sound and
light

11. 3. Nuclear Energy
the energy of the nucleus of an atom
 Fission
 Fusion

12. The Sun
Giant nuclear fusion
reactor
Ultimate source of
energy for our planet

13. 4. Chemical Energy
the energy of rearranging atoms
 Is photosynthesis endothermic or
exothermic?
 Is respiration endothermic or
exothermic?

14. 5. Sound Energy
the energy of vibrating particles
-caused by
vibrations &
carried through
a substance.

15. 6. Light Energy
the vibrations of electrically charged particles
Called PHOTONS 

16. The EM Spectrum
 Visible light is one portion of
the Electromagnetic Spectrum.
 All of these waves are energy-
filled waves.
 Insects, like bees, see shorter
wavelengths than humans.
What type of EM waves do
they see?
WATCH IT! - prism

17. Possibilities of Light
Light rays move away from their source in straight lines.
When they hit something, they are either
Absorbed Reflected Refracted
(stopped) (bounced off) (bent)
WATCH IT! - Mirror

18. Sound & Light: Alike, but Different
Sound Light
*vibration *does NOT
*needs a medium need a medium
*longitudinal *transverse

19. 7. Thermal Energy
the total kinetic energy of the particles
 more thermal energy
= faster moving
particles
 less thermal energy
= slower moving
particles

20. Thermal Energy vs. Heat
Heat is the transfer of energy between
objects that are at different
temperatures.

21. Three Kinds of Heat
Conduction Convection Radiation
(touch) (current) (rays)
Hot Cold
Common