Thermal Energy
Define thermal energy
Energy of heat
Define energy conversions
Energy conversions: Energy converting from one type of energy to another.
Define electrical energy
Charged particles that move between points to power devices
Define:
- Kinetic energy
- Gravitational energy
- Kinetic energy: Energy of motion
- Gravitational energy: Potential energy of an object based on the position of the object in the air
Give an example of a chemical reaction that produces chemical energy?
Check students answer.
What are the 2 things that determine the amount of thermal energy an object has?
- Mass
- Temperature
What is the formula to solve for temperature change from a chemical reaction.
Ending Temperature (-) Initial Temperature
Define light energy
Light energy: Energy that can be seen from sources like the sun, light bulbs and flashlights
List the 8 types of energy that you have learned about in this unit.
- Kinetic
- Gravitational
- Thermal
- Electrical
- Elastic
- Light
- Sound
- Chemical
What type of energy transformations is occurring in a solar cooker?
Light energy from the sun transforming into thermal energy heating up the cooker
What are your 3 states of matter that molecules move around in thermal energy?
- Solid
- Liquid
- Gas
Why does the height of a tennis ball get smaller each time the ball bounces?
The tennis ball loses energy each time it bounces.
What are the 3 things that need to be present in Electrical energy?
Closed Circuit
Power Source
Conductor
At what point of bouncing a basketball does it go through elastic energy?
When the ball hits the ground, it goes though elastic energy because the ball is being deformed by being compressed from hitting the floor.
Multiple choice.
Which of the following does not represent energy being converted?
a. stretching a rubber band and then letting it go
b. dropping a ball
c. playing with a yo-yo
d. a book sitting on a desk
d. a book sitting on a desk
Fill in the blank and choose the correct answer.
1. When molecules are heated up the molecules move _______________ at a (higher or lower) temperature
2. When molecules are cooled down the molecules move _______________ at a (higher or lower) temperature
1. Faster, Higher
2. Slower, Lower
Fill in the blanks with what type of energy conversion is taking place from start to finish.
Fireworks:
Start. _________—>___________—>_________—>___________—>____________ End
Start. CHEMICAL —> KINETIC —> THERMAL —> SOUND—> LIGHT End.
Can light be considered a type of energy? Explain your answer.
Yes, because light energy can transform into other types of energy.
Define:
- Chemical energy
- Sound energy
- Chemical energy: Energy that is produced from a chemical reaction
- Sound energy: Energy made by vibrations that move and bump into each other that can be heard
Which type of energy conversion is involved when the arrow is released from a bow and arrow?
________ ---> _________
When the bowstring is released, this elastic energy is transformed into the kinetic energy of the arrow.
Read the passage and solve for the temperature change.
A student conducts a chemical reaction experiment with a saltwater solution immersing a sheet aluminum foil in. The initial temperature of the saltwater solution is 75.8 degrees. After placing the foil in the solution, the temperature increased to 98.3 degrees.
Solve. What was the temperature change?
Temperature change: 22.5 degrees
What energy conversions occur when a ball bounces from the air to the ground and back up in the air?
Gravitational energy —> Kinetic energy —> Elastic energy —> Kinetic energy —> Gravitational energy
Using the picture of an electrical circuit label the four different parts.
a.
b.
c.
d.
a. Wire
b. Battery
c. Wire
d. Motor
What type of energy transformations are occurring if a person is outside putting suntan lotion on to get a suntan? Explain answer.
Light energy ---> Chemical energy
The light energy from the sun is reacting to the suntan lotion on the skin to produce a final product of a suntan.
Which object has more thermal energy a large pot of water or a small pot of water at the same temperature?
A large pot of water has more thermal energy because it's bigger in size