Conservation of Energy
Grade 8 · Science · Energy and Waves · Alberta, Canada
Lesson Summary
Energy cannot be created or destroyed, only transformed from one form to another.
Explanation
The law of conservation of energy states that the total energy in a closed system stays the same. Energy can change forms—a light bulb converts electrical energy to light and heat—but the total amount does not increase or decrease. When you drop a ball, potential energy becomes kinetic energy on the way down, and some turns to heat and sound when it hits the ground. Tracking these transformations helps explain many natural and engineered processes.
Practice Questions
Q1: A pendulum swings back and forth. Where does it have the most kinetic energy?
Answer: At the lowest point of its swing, where it is moving fastest and has the least potential energy.
Q2: If energy is conserved, why does a bouncing ball eventually stop?
Answer: Each bounce converts some kinetic energy into heat and sound, so less energy is available for bouncing until the ball stops.
Q3: What energy transformation occurs when you rub your hands together?
Answer: Kinetic energy (the motion of your hands) is transformed into thermal energy (heat) through friction.
People Also Ask
What is Conservation of Energy in Grade 8 Science?+
Conservation of Energy is a lesson in the Energy and Waves chapter of Grade 8 Science. It is part of the Alberta, Canada school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Conservation of Energy?+
Conservation of Energy is taught in Grade 8 as part of the Science curriculum in Alberta, Canada.
How can I help my child with Energy and Waves in Science?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Energy and Waves topics.