Changes in Energy

Lesson Content:

1. Recap of Energy Changes:
   • Conservation of energy: Energy cannot be created or destroyed, only converted from one form to another. The total energy at the start and end remains the same.
   • Forms of energy focused on in the lesson: Kinetic energy, gravitational potential energy, and elastic potential energy.
2. Formulas for Energy Calculation:
   • Kinetic energy formula: KE = (1/2) x mass x velocity²
   • Gravitational potential energy formula: GPE = mass x gravitational constant x height
   • Elastic potential energy formula: EPE = (1/2) x spring constant x extension²
3. Example Calculation:
   • Scenario: A 2-kilogram ball is dropped from a height of 5 meters with a gravitational constant assumed as 10 meters/second².
   • Calculation steps:
     • Change in gravitational potential energy: ΔGPE = -100 Joules
     • Final kinetic energy: KE = 100 Joules
     • Initial energy: 0 Joules
     • Calculation of final velocity: V = 10 meters/second
4. Key Concepts:
   • Ability to calculate kinetic energy, gravitational potential energy, and elastic potential energy.
   • Understanding the concept of conservation of energy.
   • Applying conservation of energy to solve energy-related questions.