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Impulse and Momentum. Newton’s F irst Law In the absence of unbalanced forces, the momentum of an object will be constant. . When a body is accelerating, the resultant force acting on it is equal to its A. change of momentum. B. rate of change of momentum.
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Newton’s First Law In the absence of unbalanced forces, the momentum of an object will be constant.
When a body is accelerating, the resultant force acting on it is equal to its A. change of momentum. B. rate of change of momentum. C. acceleration per unit of mass. D. rate of change of kinetic energy.
Newton’s Second Law The acceleration of the object is proportional to the net force and inversely proportional to its mass. Fnet= ma or Fnet = Δ p/Δ t net force = rate of change of momentum
We can express this as or or
Conservation of momentum helped scientists discover the neutrino. In the 1920s it was observed that in a beta decay, a nucleus emitted a beta particle. However, when the nucleus recoiled, it was not in the opposite direction to the emitted electron. Thus, the momentum of these particles did not comply with the law of conservation of momentum. In 1930 Wolfgang Pauli determined that another particle must also have been emitted. This particle, the neutrino, was not detected experimentally until 1956.
