Chemical Energy
What is chemical energy?
Energy stored in bonds between atoms.
What is mechanical energy?
Mechanical energy is the energy of motion or position.
What is light energy?
What energy transformation takes place when a microwave heats leftovers?
Electrical energy → Thermal (heat) energy
What are three ways heat moves?
Conduction, convection, and radiation
When you digest food, chemical energy turns into what two types of energy your body uses?
Mechanical & Thermal Energy
What two types of energy make up mechanical energy?
Kinetic energy and Potential Energy
Include three energy transformations that take place in a battery-operated flashlight.
Chemical to Electrical to Light/Heat
What energy transformation takes place when a video game controller vibrates?
Electrical energy → Mechanical (vibration) energy
Energy is the ability to cause change.
A candle flame shows chemical energy changing into two types of energy. Name both.
Light & Thermal Energy
When you pull back on a slingshot, what kind of energy are you storing?
Potential Energy (specifically, ELASTIC potential energy)
What structure changes light energy into electrical energy?
solar panels
What energy transformation takes place when you bend a glow stick to activate it?
Chemical energy → Light energy
Energy can not be created or destroyed. It TRANSFORMS!
If you leave a flashlight on overnight and the battery dies, what happened to the chemical energy in the battery?
The chemical energy was used and changed into electrical energy, light, and heat.
Why does a stretched spring have mechanical energy even when it isn't moving?
Because it stores potential energy.
What are four behaviors of light?
Transmit, refract, reflect, absorb
What energy transformation takes place in a wind turbine?
Mechanical energy (wind) → Electrical energy.
A kid touches the side of a hot mug of cocoa. How is thermal energy moving?
From the mug to the kid's hand.
If a log burns in a fire, where did the energy in the fire originally come from?
The chemical energy stored in the wood.
Explain how a playground swing shows both potential and kinetic energy.
At the highest points it has potential energy, and as it moves downward it changes into kinetic energy.
Fill in the blank:
During refraction, light _________ when it travels from one medium to another. The light ray's speed and direction change.
During refraction, light BENDS when it travels from one medium to another. The light ray's speed and direction change.
What energy transformation takes place when a human talks? (Include 3)
Chemical energy → Mechanical energy (vocal cords vibrating) → Sound energy.
Which of the three ways heat moves best describes the kids hand touching the mug of hot cocoa?
conduction