This definitions covers Key Definitions 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 9 of 15 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
Topic position
Section 9 of 15
Practice
15 questions
Recall
30 flashcards
📖 Key Definitions
Kinetic energy: The energy stored in a moving object. E_k = ½mv². Units: Joules (J).
Mass: The amount of matter in an object. Measured in kilograms (kg). Do not confuse with weight (which is a force in Newtons).
Velocity: Speed in a particular direction. Measured in metres per second (m/s). Must be squared in the KE equation.
Work-energy theorem: The work done on an object equals the change in its kinetic energy. W = ΔE_k.