The video introduces energy transformation, emphasizing its necessity for various activities. It explains the law of conservation, stating energy cannot be created or destroyed, only transformed. Various forms of energy, such as kinetic, electrical, and chemical, are discussed. The video uses a car engine to illustrate energy transformation from chemical to kinetic energy, highlighting wasted energy. Sankey diagrams are introduced as tools to visualize energy conversion and calculate efficiency. The video concludes with review questions to reinforce learning.

Why do we need energy in our daily lives?

• To destroy unwanted energy

• To perform various activities

• To create new energy

• To store energy for future use

Tags

NGSS.MS-ESS3-4

What does the law of conservation of energy state?

• Energy can be created and destroyed

• Energy can only be transformed from one form to another

• Energy is always wasted

• Energy is only found in chemical form

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is NOT a form of energy?

• Electrical

• Chemical

• Magnetic

• Kinetic

What type of energy is stored in the fuel of a car?

• Electrical energy

• Chemical energy

• Kinetic energy

• Nuclear energy

What is wasted energy?

• Energy that is stored for later use

• Energy that is not transformed

• Energy that is transformed into unwanted forms

• Energy that is used efficiently

What is the purpose of a Sankey diagram?

• To calculate the total energy input

• To measure the speed of energy transformation

• To illustrate how energy is stored and converted

• To show the amount of energy created

In a Sankey diagram, what does the width of the arrows represent?

• The direction of energy flow

• The speed of energy transformation

• The type of energy

• The amount of energy involved

Tags

NGSS.MS-PS3-5

How do you calculate the efficiency of an energy transformation?

• Subtract the wasted energy from the total energy input

• Divide the useful energy output by the total energy input

• Multiply the useful energy output by the total energy input

• Divide the total energy input by the useful energy output

Tags

NGSS.MS-PS3-5

What percentage of energy is converted into kinetic energy if the input is 100% and 40% is useful?

• 100%

• 60%

• 40%

• 0%

Tags

NGSS.MS-PS3-5

What happens to the remaining energy if 40% is converted into kinetic energy in a car?

• It is stored for later use

• It is transformed into wasted energy such as heat and sound

• It is destroyed

• It remains as chemical energy

Tags

NGSS.MS-PS3-5