Podcast
Questions and Answers
A roller coaster car climbs to the highest point on the track. Which energy transfer accurately describes this scenario?
A roller coaster car climbs to the highest point on the track. Which energy transfer accurately describes this scenario?
- Kinetic energy is converted into gravitational potential energy. (correct)
- Gravitational potential energy is converted into kinetic energy.
- Internal energy is converted into gravitational potential energy.
- Kinetic energy is converted into chemical energy.
Which of the following best describes the energy transformation in an electric kettle heating water?
Which of the following best describes the energy transformation in an electric kettle heating water?
- Electrical energy to internal energy to thermal energy. (correct)
- Chemical energy to electrical energy to kinetic energy.
- Kinetic energy to electrical energy to thermal energy.
- Electrical energy to kinetic energy to gravitational potential energy.
A pendulum swings back and forth. At which point is the transfer from potential to kinetic energy most evident?
A pendulum swings back and forth. At which point is the transfer from potential to kinetic energy most evident?
- At the lowest point of the swing.
- At the highest point of the swing.
- Midway between the highest and lowest point. (correct)
- The transfer is constant throughout the swing.
What do the arrows in transfer diagrams represent?
What do the arrows in transfer diagrams represent?
A bouncing ball loses height with each bounce. Which of the following energy transfers best explains why?
A bouncing ball loses height with each bounce. Which of the following energy transfers best explains why?
What does the width of an arrow represent in a Sankey diagram?
What does the width of an arrow represent in a Sankey diagram?
A car brakes suddenly. Which energy transfer primarily occurs?
A car brakes suddenly. Which energy transfer primarily occurs?
What is the function of transfer diagrams?
What is the function of transfer diagrams?
Which of the following provides a measure of the energy given to charge carriers in a circuit?
Which of the following provides a measure of the energy given to charge carriers in a circuit?
During energy transfer, what happens to the total amount of energy in a closed system?
During energy transfer, what happens to the total amount of energy in a closed system?
Flashcards
Energy
Energy
The capacity for doing work; it exists in different stores and can be transferred or dissipated but never created or destroyed.
System
System
An object or group of objects.
Transfer
Transfer
When something is moved from one place to another; this may be people, objects, or energy.
Energy stores
Energy stores
Signup and view all the flashcards
Energy transfer
Energy transfer
Signup and view all the flashcards
Gravitational potential energy
Gravitational potential energy
Signup and view all the flashcards
Transfer diagrams
Transfer diagrams
Signup and view all the flashcards
Sankey diagrams
Sankey diagrams
Signup and view all the flashcards
Study Notes
- Energy exists in different 'stores'.
- Energy cannot be created or destroyed.
- Energy can be transferred, dissipated, or stored in different forms.
- Energy can remain in the same store for varying durations, from millions of years to fractions of a second.
- Energy transfers occur continuously whenever a system undergoes changes, affecting how energy is stored.
- Examples include a boat moving through water converting chemical energy to kinetic energy.
- Heating water in an electric kettle: electrical energy increases the internal energy of the element, which increases the internal (thermal) energy of the water, raising its temperature.
- A swinging pirate ship involves the transfer of kinetic energy into gravitational potential energy and vice versa.
- Energy transfer occurs via heating, waves, electric current, or a force moving an object.
- The potential difference (voltage) measures the energy given to charge carriers in a circuit, measured in volts (V).
- Voltage facilitates electric current flow between two points.
- Energy is released by a material, causing a decrease in its internal energy, such as infrared radiation from the Sun.
- 'Work' signifies energy transfer, demonstrated by examples like a grazing cow, a firing catapult, and a boiling kettle.
- Diagrams can illustrate energy transfers from one store to another, including transfer diagrams and Sankey diagrams.
- Transfer diagrams use boxes for energy stores and arrows for energy transfers.
- For example, a child at the top of a slide has gravitational energy that transfers as mechanical work to increase speed and overcome friction.
- This results in a shift from gravitational potential energy to kinetic energy and internal energy.
- Sankey diagrams begin as one arrow that splits, showing how energy in a system transfers into different stores.
- Sankey diagrams show the amount of energy in each source, and the width of the arrow is scaled to represent the amount of energy.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
