The resultant force acting on an object is directly proportional to the rate of change of momentum and is in the same direction.The momentum of an object is the product of its mass and velocity.If the mass of the object is constant, if the momentum changes then the velocity changes. The change of velocity is called acceleration, so at constant mass Newton's second law effectively states that:The resultant force acting on an object is directly proportional its acceleration and is in the same direction.
Newton's Second Law of Motion
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Specification: OCR Physics A (H156), AS-level, 3.5.1 Newton's laws of motion. Topic: Momentum.
Key terms in this lesson
- electric charge
- A physical property of matter that causes it to experience a force in an electric field; it can be positive or negative and is measured in coulombs.
- resistance
- The ratio of the potential difference across a component to the current through it.
More in Momentum
- Newton's First Law of Motion.
- Newton's Third Law of Motion
- The Four Fundamental Forces
- Linear Momentum
- Conservation of Momentum
- Explosions vs Collisions
- Elastic and Inelastic Collisions
- Air Bags
All 14 lessons in Momentum · All OCR AS-level Physics topics