Forms of Energy
What are some changes that can be caused by sound energy?
Vibrations in solid, liquid, or gas
The energy in wind used to generate electricity is what?
Kinetic Energy
Energy that is stored in the composition of matter
Describe two ways in which hybrid cars are more energy-efficient than gasoline cars
Less fuels and convert heat from brakes into electrical energy
What does potential energy depend on?
Position or chemical composition
What are some changes that are caused by electromagnetic energy?
Lighting a dark room
A skier on a hill has potential energy due to what?
Its Position
Measurement of usable energy after an energy conversion.
Energy Efficiency
List an advantage and disadvantage of solar power
Clean, unlimited supplies
Inefficient and expensive
All forms of energy are a combination of ____ and _____ energy
Potential and kinetic
What two factors determine an object's kinetic energy?
Mass and Speed
Which type of energy is transmitted by vibrations of air?
Sound
What law states that energy can neither be created nor destroyed?
Law of Conservation of Energy
An airplane has a large amount of _____ energy in flight due to its large mass and fast velocity
Kinetic
How does changing a skater's mass and speed affect his or her kinetic energy?
Increasing mass or speed increases kinetic energy. Decreasing either will have the same effect on kinetic energy.
Explain the law of conservation.
Energy can change forms, but the overall amount of energy is constant.
What are three forms of electromagnetic energy?
Visible light, x-rays, Microwaves
What are solar cells made up of?
Several layers of light-sensitive materials
A dog's bark is an example of ______ energy
Sound
Which energy conversion is more efficient? A soccer ball kicked along a smooth sidewalk or a soccer ball kicked in a field of tall grass? Why?
Sidewalk because less energy will be changed into heat by friction.
When energy is converted from one form to another, what is actually produced?
Heat
What type of energy has the source of energy in the center of an atom?
What do solar cells do?
Convert sunlight directly into electrical energy
We all get energy from the food we eat. The form of energy that is in food is called ______ energy. Our bodies use this energy to grow and move.
Chemical
Give an example of an energy conversion that produces unwanted forms of energy
Light bulbs that release heat plus light. Fans that release sound and wind, etc.