Thermodynamics short lesson

Thermodynamics, Physical Science

Practice Lesson Key Ideas

Multiple Choice

What is the science or study of thermodynamics?

• Thermodynamics is the science concerned with heat and it’s movement.

• Thermodynamics is the science concerned with anything related to thermal energy.

• Thermodynamics is the science concerned with discovering new forms of energy

What is HEAT?

Multiple Choice

Thermal energy leaves my hand and warms the ice cube I am holding.

The movement of thermal energy is always from a __?__ object to a __?__ object

• from cooler object to a warmer object

• from warmer object to a cooler object

Poll

After running for awhile, does your car's engine get hot & release heat into the surrounding air?

• Yes!

• No way

• I am not sure

Waste Energy is Heat Energy

The Heat Energy released from your car is WASTE energy (thermal), a product of every energy transformations.

(Energy in gas - some converts to mechanical energy and some to thermal energy)

Multiple Choice

When energy changes form, some energy is always "lost" to heat.

• TRUE

• FALSE

Waste energy-HEAT

Every time energy changes form, some of it is LOST as waste energy (waste, because it is useless). Waste energy is in the form of thermal energy.

Multiple Choice

In every transformation, some energy is lost to waste energy.

In terms of efficiency, every energy transformation is ________.

• 100% efficient

• Less than 100% efficient

• More than 100% efficient

1st Law of Thermodynamics

is also the Law of Conservation of Energy!

ENERGY...

-Can transform from one form to another

-But cannot be created

-And cannot be destroyed

-Total always remains the same

2nd Law of Thermodynamics

The 2nd law states that “whenever energy changes form, some of it is always converted to thermal waste energy (heat) & released" to the surroundings

Multiple Choice

What does the First Law of Thermodynamics state?

• energy can be transformed but cannot be created or destroyed

• when energy changes form, some is converted to heat energy

• the science concerned with heat and movement

• heat energy released to the environment is thermal pollution

Multiple Choice

What does the Second Law of Thermodynamics state?

• energy can be transformed but cannot be created or destroyed

• when energy changes form, some is converted to heat energy

• the science concerned with heat and movement

• heat energy released to the environment is thermal pollution

Multiple Choice

What is thermal pollution?

• Heat released to the air & water, causing changes

• Heat used to warm up a cold area.

• A product of radiant light energy

• Pollution caused by broken thermometers

The Car is 16% Efficient - (16 useful units/100 total units) x 100%

Multiple Choice

What is efficiency?

• a measure of the useful energy we get from an energy transformation, compared to total energy

• a measure of the waste energy we get from an energy transformation, compared to total energy

Multiple Choice

What is one disadvantage of having a car that is inefficient?

• Increased tire wear

• The time is takes to get somewhere

• Low speed of the car

• Air pollution