Energy Change and Conservation

Energy Change and Conservation

8th Grade Science

Open Ended

What does it mean for energy to be transferred?

Energy Transfer

The process of energy moving from object to another without changing form.
Some Examples Include:

• Kicking a soccer ball: Your mechanical energy transfers to the ball, making it move.

• Sitting by a campfire: Thermal energy from the fire moves through the air and warms your hands.

• Charging a Chromebook: Electrical energy moves from the outlet into the Chromebook’s battery.

Open Ended

What does it mean for energy to be transformed?

Energy Transformation

The process of energy changing from one form or another.
Some examples include:

• Microwave: Electrical energy transforms into thermal energy to heat your food.

• Riding a bike: Your chemical energy from the food you eat transforms into mechanical energy as you pedal and move.

• Playing video games: Electrical energy transforms into radiant energy (the screen), sound energy (game sounds), and mechanical energy (vibrations in the controller).

Open Ended

What is energy conservation?

Multiple Choice

During a camping trip, Ming gathers firewood and arranges it in the fire pit. She sets it on fire, and the result is a roaring blaze. Which statement best shows all the energy transformations that take place?

• chemical to thermal

• thermal to electromagnetic

• chemical to thermal and radiant

• chemical and radiant to thermal

Multiple Choice

Johanna took her little brother to the playground because he likes to

swing. Look at the diagram below that shows Johanna pushing her

brother on a swing. Which statement is true about the transformation between kinetic and potential energy while the boy swings?

• Kinetic energy changes to potential energy between points A and B.

• Potential energy changes to kinetic energy between points A and B.

• Potential energy changes to kinetic energy between points B and C.

• Potential and kinetic energy remain constant between points A and C.

Multiple Select

As a candle burns on the table, you can see the radiant energy and feel the thermal energy released. Which two statements are true about the energy involved in burning the candle?

• Chemical energy is created from electromagnetic energy when the candle burns.

• The total amount of all types of energy is conserved when the candle burns.

• Thermal and chemical energy are destroyed by the radiant energy when the candle burns.

• The total chemical energy equals the radiant and thermal energy released when the candle burns.

Multiple Choice

Andre is boiling water to cook pasta. The diagram below shows some of the changes that occur when water is heated and boiled. These changes involve both energy transfers and energy transformations.

What is the difference between an energy transfer and an energy transformation?

• Transfer is movement of energy from one place to another, and transformation is the change of one type of energy to another.

• Transformation is movement of energy from one place to another, and transfer is the change of one type of energy to another.

• There is no difference. Both involve movement of energy from one place to another.

• There is no difference. Both involve the change of one type of energy to another.

Open Ended

Describe one example of an energy transformation in this diagram and explain why it is a transformation. Repeat this description and explanation for an energy transfer.

DO NOW:

• Interactivity: Racing for Kinetic Energy

• Interactivity: Roller Coasters and Potential Energy

  • Homework, if not finished in class.

• Reminder: Vocab DUE TODAY!