Download Pop Quiz pp. 151-155 What two forms of energy combine to make

Pop Quiz pp. 151-155
1. What two forms of energy combine to make mechanical
energy?
2. What kind of potential energy does a projectile have?
3. Lava was used as an example of this type of energy.
4. Food and fuels are examples of this type of energy.
5. What form of energy are microwaves?
Notes – Forms of Energy
Mechanical Energy
-
Associated with the position and motion of an object
ME = PE + KE
Direct relationship between variables
Ex. A projectile
ME remains the same even if PE and KE change
The more ME an object has, the more work it can do
Energy associated with the particles that make up an object:
- Particles are constantly moving  KE
- Particles are arranged in specific ways  PE
1. Thermal energy
a. PE and KE of particles = TE
b. The hotter something is, the more TE it has
c. Ex. Lava, melting ice cream
2. Electrical energy
a. Energy of electric charges
b. Either flowing or stored
c. Extremely useful form
d. Ex. Lightning, batteries, electrical lines
3. Chemical energy
a. PE stored in chemical bonds that hold compounds
together
b. When bonds are broken, energy is released
c. Calories tell you the amount of stored energy in a serving
of food
d. Ex. Food, fuel, a match
4. Nuclear energy
a. PE stored in the nucleus of an atom
b. E released during a nuclear reaction
c. Extremely productive
d. Ex. TMI
5. Electromagnetic energy
a. The E of light and other forms of radiation
b. E that travels in waves
c. Has some electrical and some magnetic properties
d. Ex. Microwaves, ultraviolet radiation, infrared, radio
waves
Questions
1. What is ME?
2. If an object’s ME is equal to its PE, how much KE does the
object have?
3. If the KE of a falling apple is 5.2 J and its PE is 3.5 J, what is its
ME?
4. List the five forms of energy associated with the particles that
make up objects.
5. Come up with an acronym to help you remember the five
forms of energy associated with the particles that make up
objects.
6. Why do the particles of objects have both kinetic and potential
energy?
7. What kind of E do you experience when you eat a peanut
butter and jelly sandwich?
8. How are calories related to energy?
9. What forms of energy are released by a working flashlight?
10. Identify the types of energy in the following passage.
As the crowd at the football game settles down after a
touchdown celebration, you shiver. The sun is setting, and the
afternoon is growing cool. A vendor hands you a hot dog, and
its heat helps warm your hands. Suddenly the stadium lights
switch on. You can see the players more clearly now.
Answers
1. ME is the form of E related to the position and motion of an
object.
2. Its KE is zero b/c ME = PE + KE.
3. Its ME is 8.7 J
4. Thermal, electrical, chemical, nuclear, and electromagnetic
5. Answers will vary
6. Particles are constantly in motion, so they have KE. The also
have PE as a result of their specific arrangement in objects.
7. You experience CE in the sandwich.
8. Calories are the amount of energy stored in a serving of food.
9. TE and EME
10. Celebration/shivering – KE; sun – EME; hot dog – TE, CE; lights
– TE and EME
Name______________________________ Date______________ Pd____
The KE of a 500 N diver during a dive from a 10 m platform was
calculated. The graph shows the results of the data analysis. Use
the graph to answer the following questions.
Energy of a Diver
12
Height (m)
10
8
6
4
2
0
0
1,000
2,000
3,000
4,000
5,000
Kinetic Energy (J)
1. According to the graph, how much KE does the diver have at 8
meters?
2. At what height does the diver have 4,000 J of KE?
3. What happens to the ME of the diver as he/she dives?
4. What is the ME of the diver?
5. Find the KE of the diver at 6 m.
6. Calculate the PE of the diver at 6 m.