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9702 · 5.2

Gravitational potential energy and kinetic energy

Welcome to this crucial topic in Cambridge Physics! We're diving into **Gravitational Potential Energy (GPE)** and **Kinetic Energy (KE)** - two fundamental forms of energy that dictate how objects move and interact within a gravitational field. Understanding these concepts is key to explaining everything from falling apples to orbiting satellites, and it forms the bedrock for many advanced physics principles. Let's get started! This pilot aligns with **Senpai Corner** AS notes (2025-2027) for topic **5.2**.

Need to know

What you need to know

  • GPE depends on mass, gravity, and *vertical* height.
  • The reference point for 'h' is arbitrary; it defines where GPE is zero.
  • Work done against gravity increases GPE.
  • GPE is a scalar quantity, and can be positive or negative.
  • GPE formula $mgh$ is valid for uniform gravitational fields (near Earth's surface).

Explanation

Gravitational potential energy and kinetic energy

  1. GPE depends on mass, gravity, and *vertical* height.
  2. The reference point for 'h' is arbitrary; it defines where GPE is zero.
  3. Work done against gravity increases GPE.
  4. GPE is a scalar quantity, and can be positive or negative.
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