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# P4.1 - Newton

### Newton's Laws and Momentum - OCR A2 Physics

Newton's first law: An object will remain at rest or constant speed in a straight line unless acted upon by an external force.
Newton's second law: The net force of an object is equal to the rate of change of momentum.
Newton's third law: In equilibrium, whenever body a exerts a force on body b, body b simultaneously exerts an equal but opposite force on body a.
What is a pair force? A pair of forces of the same type, of equal magnitude and in the opposite direction.
Define momentum: Momentum = mass x velocity
What is the principle of conservation of momentum? The total momentum of a system remains constant unless acted upon by an external force.
What does 'impulse' mean in terms of force and time? Impulse is another word for the rate of change of momentum.
What is an elastic collision? Both energy and momentum are conserved. Therefore no energy is lost.
What is an inelastic collision? Energy is not conserved, however momentum is. All real world collisions are this type.
Give vague details of an experiment to show principle of conservation of momentum: Air track, light gates, data logger, measure mass, fire at each other, compare momentum of before and after.
Created by: Sparksy