Summary
Energy is the ability to do work, and it can be transferred or converted between different forms but is never created or destroyed. Power is the rate at which work is done or energy is transferred.
Exam Tips
Key Definitions to Remember
- Work — Work done (J) = Force (N) x distance (m)
- Kinetic Energy — Energy due to motion, calculated as ½ x mass x velocity²
- Gravitational Potential Energy — Energy due to an object's position in a gravitational field
- Power — Rate of energy transfer or work done, measured in Watts (W)
Common Confusions
- Confusing energy transfer with energy creation or destruction
- Mixing up kinetic and potential energy
Typical Exam Questions
- What is the formula for work done? Work done = Force x distance
- How is kinetic energy calculated? Kinetic energy = ½ x mass x velocity²
- What happens to energy when a ball is thrown upwards? Kinetic energy is converted to gravitational potential energy
What Examiners Usually Test
- Understanding of energy conservation
- Ability to calculate work, energy, and power
- Knowledge of energy transfer processes