1. What is Energy? Key Concepts: Vocabulary: Explain the relationship
Chapter 5, Section 1
Pages ( )
Explain the relationship
between energy and work
Compare kinetic and
potential energy
Vocabulary:
Describe different
forms of energy
energy
Kinetic energy
potential energy
mechanical energy

2. Energy p. 124 The ability to do work
Work is done when a force causes an object to move in the direction of the force
Maglio does work on his bat by exerting force on it.
The bat does work on the ball by exerting force on it.
The ball does work on a spectator’s baseball mit by
exerting a force on it!! “A HOME RUN”

3. The energy of an object that is due to the object’s motion
Kinetic
Energy p. 125
The energy of an object that is
due to the object’s motion
True or False?
As the baseball flies
through the air, it has
kinetic energy.
True
All moving objects
have kinetic energy.
True

4. Kinetic energy depends Speed has a greater effect
How can you measure kinetic energy?
Lets look at the math
KE = Mass (of object) x Speed (m/s)² 2
m = mass (kilograms)
v = speed (meters per second)
J = joules (unit for energy)
Kinetic energy depends
on mass and speed
Speed has a greater effect
on kinetic energy
than mass does.

5. Joule A joule is approximately the amount of energy
necessary to lift an apple one meter.
A tennis serve: 75 J
Fastball pitch : 120 J
Football pass : 150 J
Joule
Tm. P 125

6. The following video clip takes a look at Potential and Kinetic energy
In our every day lives. Lets take a look

7. Potential and kinetic energy in the real world Take a look!
Galileo's "Stop Height": Gravity and Potential and Kinetic Energy at Work

8. The energy an object has because of its position
Potential Energy
p. 126
The energy an object has
because of its position

9. Which diver has greater potential energy?
Gravitational potential energy = weight x height (distance to water) (this varies)
(10 meters)
(1 meter)

10. This video clip looks at Energy Transformations

11. Potential, Kinetic and Mechanical energy transformations.

12. Mechanical Energy p. 127 The amount of work an object can do because
of its potential and kinetic energies.
Mechanical Energy p. 127

13. Thermal Energy p. 128 All the kinetic energy due to random motion
of the particles that makeup an object.

14. Chemical Energy p. 128
That part of the energy in a substance that can
be released by a chemical reaction
Energy stored in the chemical bonds of molecules.

15. Electrical Energy p. 129
Energy of moving electrons.

16. Sound Energy p. 129
Waves of energy created
when an object vibrates

17. Light Energy Light is produced by the vibrations
of electrically charge particles.
Light Energy
Part of the
electromagnetic
spectrum we can
See.

18. Nuclear Energy Two types of nuclear energy: Energy that comes from
the nucleus of an atom.
Fusion:
Two types
of nuclear energy:
A process in which two smaller
atomic nuclei fuse into one larger
nucleus and release energy.
Fission:
The splitting of a large nucleus
into two smaller nuclei with the
emission of large amounts of energy.

19. The animation of a nuclear fusion: The animation of a nuclear fission:
Energy given off by the sun. Also the source of power for the hydrogen bomb.
The animation of a
nuclear fission:
This type of nuclear energy is
used to generate electrical energy
at nuclear power plants. Also the
type of bombs dropped on
Hiroshima and Nagasaki.

20. HM 16-5: Test explosion of a hydrogen bomb
HM 16-5: Test explosion of a hydrogen bomb. (Image from Department of Defense)
Nuclear Fusion