Intro to Energy Notes
What fuel does a wildfire use?
Trees, bushes, dead grass
What does potential energy transform into?
Potential energy transforms into Kinetic energy
How do plants turn into coal
Over millions of years heat and pressure produce chemical changes that release hydrogen and coal is formed.
What are the 3 components for a fire to continue to burn?
Oxygen, Heat, Fuel
Power is used to describe flow rates for?
Energy transformations
During combustion, (1)... reacts with fuel to produce (2)... and (3)... energy is (4)released/gained.
1. oxygen 2. Carbon dioxide 3. water
4. released
Why is energy hard to define?
Energy is hard to define because there are so many forms.
What two things does the amount of power from a waterfall depend on?
Amount of water flowing and height of the fall
Chemical Potential energy is converted to Kinetic energy when
Bonds break and distances change
Why do nutrition labels use Calories instead of calories?
They use Calories instead of calories because 1 Calorie is 1000 calories so it looks like less
A watt is equivalent to...
1 joule/second
What are molecules held together by?
Chemical bonds
What is Kinetic energy?
What is Potential energy?
Kinetic energy is the energy when an object is in motion
Potential energy is the energy the object has when its still
What type of energy is gasoline?
Chemical potential energy
Explain these two reaction types: Exothermic and Endothermic
Exothermic: Heat is released to the surroundings because the reaction products are at a lower energy level.
Endothermic: Heat is absorbed because the products are at a higher energy level.