UNIT OVERVIEW

Energy is one of the most important ideas in physics. It explains how things move, change, and interact. In this unit, you will learn what energy is, how to calculate it, and how it transforms from one form to another.

The key principle you will use throughout this unit is:

Energy cannot be created or destroyed — it can only change from one form to another.

This is called the law of conservation of energy.

What You Will Learn

• How to calculate gravitational potential energy (energy stored due to height)
• How to calculate kinetic energy (energy of motion)
• What mechanical energy is and how to find it
• The law of conservation of mechanical energy and when it applies
• How to solve problems using energy conservation
• How to conduct and interpret the prescribed experiment on conservation of energy

Why This Matters

Energy conservation principles are used everywhere:

• Engineers design roller coasters by calculating how height relates to speed
• Hydroelectric dams convert the potential energy of water into electrical energy
• Understanding kinetic energy explains why speeding vehicles cause more damage in crashes

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