Unit 1: Energy

This section covers the essential GCSE Physics equations related to energy concepts.

Equations to Learn

1. Kinetic Energy: Ek = ½mv²

   Definition: Kinetic energy is the energy an object possesses due to its motion.

2. Power: P = W/t (work done / time taken)

   Highlight: Power is a measure of the rate at which energy is transferred or work is done.

3. Efficiency:

   • efficiency = useful energy output / total energy input
   • efficiency = useful power output / total power input

   Example: A light bulb with 20% efficiency converts 20% of electrical energy into light energy, with the rest becoming heat.

4. Gravitational Potential Energy (GPE): Ep = mgh

   Vocabulary: 'm' is mass, 'g' is gravitational field strength, and 'h' is height.

Equations Given in the Exam

1. Elastic Potential Energy: Ee = ½ke²

   Definition: This is the energy stored in a stretched or compressed elastic object.

2. Energy Transferred: ΔE = mcΔθ

   Highlight: This equation is crucial for calculating changes in thermal energy.

The AQA Physics equation sheet GCSE Higher tier includes these formulas, making it essential for students to understand their applications thoroughly.