Energy associated with the motion and position of everyday objects.
What is mechanical energy?
100
Energy cannot be created nor destroyed describes this law.
What is the Law of Conservation of Energy
100
In what direction does heat flow?
From hotter objects to colder objects?
100
What do conduction, convection and radiation all have in common?
The three ways in which heat is transferred.
200
This form of energy depends on it mass and velocity.
What is Kinetic Energy?
200
A cup of hot cocoa possesses this form of energy.
What is thermal energy
200
KEi + PEi = ?
KEi + PEi = KEf + PEf
200
Does an ice cube possess thermal energy? Explain.
Yes, anything with mass has thermal energy.
200
A stove burner exhibits what type of heat?
What is radiant heat?
300
Energy that is stored as a result of position or shape.
What is Potential Energy?
300
Stored energy in gasoline, coal and sugars.
What is chemical energy
300
E = mc^2
What does the E, m and c stand for AND what are the units?
E = Energy (J)
m = Mass (kg)
c = speed of light (m/s) = 3.0x10^8 m/s
300
Temperature is a measure of . . . ?
The average kinetic energy of particles in an object
300
What are two examples of good thermal conductors?
Solids, metals, tile, etc.
400
Are kinetic and potential energy mutually exclusive? Give an example to prove your point.
No, a falling object has both kinetic and potential energy.
400
This form of energy is converted into electrical energy stored in solar panels.
What is electromagnetic energy?
400
A pendulum has maximum or minimum potential energy at the bottom of the swing.
Minimum
400
What is specific heat?
The amount of heat energy required to raise 1 gram of matter 1 degree Celsius.
400
Give three examples of a convection current.
Ocean currents, weather systems, movement of rocks in Earth's interior, the demo we did in class, heat circulating from a fire place (heat source) in you home, etc.
500
What is the height of a 4kg cat resting on a bookshelf with 78.4J of potential energy.
g = 9.8m/s^2
PE = mgh
2m
500
Nuclear energy is . . .
The energy stored atomic nuclei.
500
What is the mass of a pile of horse manure if it possesses 1.8x10^17 J of energy?
E=mc^2
2.0kg
500
Gold has a specific heat of 0.129 J / g °C.
Wood has a specific heat of roughly 0.42 J / g °C
If 1 gram of each material were heated to 100°C, which material would hold more heat energy?
0.129(J / g °C) x 1(g) x 100(°C) = 12.9 J
0.42(J / g °C) x 1(g) x 100(°C) = 42 J
ANSWER: The Wood
500
Why is conduction slower is gases than in liquids or solids?
Gas particles are much further a part from each other, therefore they collide less often. This significantly decreases the rate in which heat can be transferred in a gas as compared to solids or liquids.