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P4.1 - Newton
Newton's Laws and Momentum - OCR A2 Physics
Question | Answer |
---|---|
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. |