Natural Sciences - Term 2 - Week 3

Energy is the ability to do work or cause change. It exists in various forms, such as kinetic energy (the energy of motion), potential energy (stored energy), thermal energy (heat), and more. Understanding energy is crucial because it helps us explain how things move, heat up, or change state. For example, when you push a toy car, you are using kinetic energy to make it move.

Consider a simple example of a light bulb. When electricity (electrical energy) flows through the bulb, it transforms into light energy and thermal energy (heat). This transformation is essential for us to see in the dark and to heat our surroundings. Another example is a rubber band; when you stretch it (potential energy), it can snap back and move quickly (kinetic energy).

Let's have a class discussion about different forms of energy. I will ask you to think of examples from your daily life. For instance, what energy transformations occur when you eat food? (Answer: Chemical energy from food is transformed into kinetic energy when you run.) Write down your examples and share them with a partner. This will help you articulate your understanding of energy and its changes.

For your mini-project, create a poster that illustrates an example of energy transformation. Choose a scenario, such as a roller coaster, a solar panel, or a wind turbine. Include drawings, labels, and a brief explanation of how energy changes form in your chosen example. Be prepared to present your poster to the class and explain the energy transformations involved.

• Stored energy
• Energy of motion
• Energy from the sun
• Energy that causes change

Answer: Energy of motion

Kinetic energy is defined as the energy that an object possesses due to its motion.

• A moving car
• A stretched rubber band
• A flowing river
• A burning candle

Answer: A stretched rubber band

Potential energy is stored energy, and a stretched rubber band has energy stored in it due to its position.

Answer: Electrical energy

Electrical energy is transformed into light energy when electricity flows through the light bulb.

• It disappears
• It changes form
• It becomes more powerful
• It is created

Answer: It changes form

Energy is conserved during transformations; it changes from one form to another but is not lost.

Answer: Photosynthesis in plants.

In photosynthesis, plants transform solar energy into chemical energy stored in glucose.

• Chemical to kinetic
• Kinetic to thermal
• Thermal to potential
• Potential to kinetic

Answer: Chemical to kinetic

When you eat food, your body transforms the chemical energy in food into kinetic energy for movement.

Answer: Heat energy.

Thermal energy is the energy that comes from the temperature of matter; it is often felt as heat.