Study Notes
Energy is the capacity of an object to do work and can be converted from one form to another but is always conserved. Work involves transferring energy to an object and is calculated as the product of force and distance. Potential energy is stored energy that can be released, such as gravitational or chemical potential energy. Energy transfers occur when energy changes from one form to another, like gravitational potential energy converting to kinetic energy as a ball rolls down a slope. Sources of energy include fossil fuels and renewable sources like solar, wind, and hydroelectric power.
Exam Tips
Key Definitions to Remember
- Energy — the capacity of an object to do work
- Work — the process of transferring energy to an object
- Potential Energy — stored energy that can be released
Common Confusions
- Confusing energy conservation with energy creation
- Misunderstanding the difference between kinetic and potential energy
Typical Exam Questions
- What is the First Law of Thermodynamics? Energy is always conserved; it cannot be created or destroyed.
- How is work calculated in terms of force and distance? Work is calculated as the product of force and distance in the direction of the force.
- What happens to energy when a ball rolls down a slope? Gravitational potential energy is converted into kinetic energy.
What Examiners Usually Test
- Understanding of energy conservation and conversion
- Ability to calculate work and understand energy transfers
- Knowledge of different sources of energy and their conversions