1 Force and Momentum 0.0 / 5 ? PhysicsMomentum and ImpulseA2/A-levelAQA Created by: Isabel CookeCreated on: 25-01-14 21:28 Unit and symbol for momentum kgms-1 or Ns. p. 1 of 11 Newton's 1st law of motion An object's momentum will not change unless an external resultant force acts on it. 2 of 11 Newton's 2nd law of motion The rate of change of momentum is proportional to the force acting on it. 3 of 11 Newton's 3rd law of motion When two objects interact with each other, they exert equal and opposite forces on each other. 4 of 11 What happens to the impact force if the duration of impact is reduced? It increases, as the same change in momentum is occurring but over a smaller time. 5 of 11 What is impulse? The change in momentum. 6 of 11 What is the change in momentum for a rebound? -2mu 7 of 11 What does the area under a force-time graph represent? The impulse or change in momentum. 8 of 11 What is the change in momentum for an oblique rebound? -2mucos(theta) 9 of 11 What is the principle of conservation of momentum? In a system, the total momentum doesn't change unless there is an external force acting on it. 10 of 11 What is the difference between an elastic and inelastic collision? Elastic kinetic energy is conserved, inelastic it isn't. 11 of 11
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