Energy Forms and Transfers
Grade 6 · Science · Study Guide
Discover the different forms of energy and how energy moves from one object or system to another.
Energy is the ability to do work or cause change. It exists in many forms and can be transformed from one type to another, but it can never be created or destroyed — this is the Law of Conservation of Energy.
The two main categories of energy are kinetic energy and potential energy. Kinetic energy is the energy of motion — anything moving has kinetic energy. Potential energy is stored energy based on position or condition. A book on a shelf has gravitational potential energy; a compressed spring has elastic potential energy.
Other common forms of energy include thermal energy (heat), light (radiant) energy, sound energy, electrical energy, and chemical energy. When you eat food, your body converts chemical energy from nutrients into thermal and mechanical energy.
Energy transfers occur in three main ways: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between particles. Convection is heat transfer through the movement of fluids (liquids or gases). Radiation is the transfer of energy through electromagnetic waves, which can travel through empty space — this is how the sun warms Earth.
Understanding energy transformations is essential in everyday life, from cooking food to powering vehicles to generating electricity.
Key terms
- Kinetic energy
- The energy an object has due to its motion; increases with greater mass and faster speed.
- Potential energy
- Stored energy based on an object's position or condition, such as a ball held above the ground.
- Conduction
- Transfer of heat through direct contact between particles of matter.
- Convection
- Transfer of heat through the movement of a fluid (liquid or gas) caused by density differences.
- Radiation
- Transfer of energy through electromagnetic waves; does not require matter and can travel through a vacuum.
- Conservation of Energy
- The law stating that energy cannot be created or destroyed, only transformed from one form to another.
Flashcards
- Energy
- The ability to do work or cause change in matter; measured in joules.
- Kinetic energy
- Energy of motion; KE = ½mv²; depends on mass and speed.
- Potential energy
- Stored energy due to position or condition; includes gravitational, elastic, and chemical forms.
- Thermal energy
- The total kinetic energy of all particles in a substance; related to temperature.
- Conduction
- Heat transfer through direct particle contact; best in solids like metals.
- Convection
- Heat transfer through fluid movement; warm fluid rises, cool fluid sinks.
- Radiation
- Energy transfer via electromagnetic waves; travels through space with no matter needed.
- Law of Conservation of Energy
- Energy cannot be created or destroyed; it only changes form.
Questions
A ball rolling down a hill is converting what type of energy into kinetic energy?
- Chemical energy
- Electrical energy
- Gravitational potential energy
- Sound energy
Show answer
Answer: Gravitational potential energy
At the top of the hill, the ball has gravitational potential energy due to its height. As it rolls down, that potential energy is converted into kinetic energy (energy of motion).
Energy can be created from nothing if enough force is applied.
Show answer
Answer: False
The Law of Conservation of Energy states that energy cannot be created or destroyed — it can only be transformed from one form to another. No process creates energy from nothing.
The transfer of heat through the movement of a liquid or gas is called ________.
Show answer
Answer: convection
Convection is heat transfer through the movement of fluids. Warm fluid becomes less dense and rises; cooler, denser fluid sinks, creating convection currents.
Which form of energy transfer allows the sun's warmth to reach Earth through the vacuum of space?
- Conduction
- Convection
- Radiation
- Compression
Show answer
Answer: Radiation
Radiation transfers energy through electromagnetic waves and does not require a medium (matter). This allows the sun's energy to travel across the vacuum of space to reach Earth.
A stretched rubber band has elastic potential energy.
Show answer
Answer: True
A stretched rubber band stores elastic potential energy. When released, that energy converts to kinetic energy as the band snaps back.
Get a personalized course on Energy Forms and Transfers built around your child.