This key facts covers How to Rearrange the KE Equation within Kinetic Energy for GCSE Physics. Revise Kinetic Energy in Energy for GCSE Physics with 15 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 6 of 15 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 6 of 15
Practice
15 questions
Recall
30 flashcards
🔧 How to Rearrange the KE Equation
Starting equation: Ek = ½mv²
To find mass (m):
- Multiply both sides by 2: 2Ek = mv²
- Divide by v²: m = 2Ek / v²
To find velocity (v):
- Multiply both sides by 2: 2Ek = mv²
- Divide by m: 2Ek/m = v²
- Square root both sides: v = √(2Ek/m)
💡 Exam tip: When finding v, you MUST square root at the end. Many students forget this step and lose marks!