P2 Topic 3 + 4 2.0 / 5 based on 1 rating ? PhysicsForces and MotionGCSEEdexcel Created by: ShammaCreated on: 20-02-13 12:59 What is Nuclear Fusion? The reaction when the nuclei of light atoms, such as hydrogen, combine to make the nucleus of a heavier atom. 1 of 7 What is Nuclear Fission? The reaction when the nucleus of a large atom, such as uranium, splits into two smaller nuclei. 2 of 7 What is a Vector? A quantity that has a size and direction. Force and velocity are examples of a vector. 3 of 7 What is Displacement? The distance travelled in a particular direction. Displacement is a vector, distance is not. 4 of 7 What is Velocity? The speed of an object in a particular direction. 5 of 7 What is Acceleration? A measure of how quickly the velocity of something is changing. It can be positive if speeding up or negative if slowing down. 6 of 7 What is Terminal Velocity? A constant, maximum velocity reached by objects falling. 7 of 7
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