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What does it mean to say that momentum (or any quantity) is conserved?
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- Can momentum be conserved for a system if there are external forces acting on the system? If so, under what conditions? If not, why not?Describe a system for which momentum is conserved but mechanical energy is not. Now the reverse: Describe a system for which kinetic energy is conserved but momentum is not.Xena (Warrior Princess, mass 65 kg) swings from a rope at an armored villain (mass 100 kg) and delivers her trademark two-footed flying kick to his breast plate, knocking him backwards. The collision brings her to a stop and she lands on her feet. Neglecting friction and measuring speeds just before and after the collision, we can expect that, to a high degree of accuracy: Kinetic energy is conserved O Neither momentum nor kinetic energy are conserved. Both momentum and kinetic energy are conserved Momentum is conserved
- What does it mean to say that momentum (or any quantity) is conserved?When a cannonball is fired, momentum is conserved for the system of cannon plus cannonball. Would momentum be conserved for the system if momentum were not a vector quantity? Explain.Bronco dives from a hovering helicopter and finds his momentum increasing. Does this violate the conservation of momentum? Explain.
- What is the relationship between saying conserved quantity and inelastic collision of two objects, as if the latter circumscribes the result, conserved quantity, if at all? Momentum, kinetic energy, neither, both. I don’t understand the relevant concepts.Which of the following statements are true about momentum? Momentum is a vector quantity. The standard unit on momentum is the Joule. An object with mass will have momentum. An object which is moving at a constant speed has momentum. An object can be traveling eastward and slowing down; its momentum is westward. Momentum is a conserved quantity; the momentum of an object is never changed. The momentum of an object varies directly with the speed of the object. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum. A less massive object can never have more momentum than a more massive object. Two identical objects are moving in opposite directions at the same speed. The forward moving object will have the greatest momentum. An object with a changing speed will have a changing momentum.Her trademark two-footed flying kick, Xena (65 kg) swings from the rope and strikes the 100 kg bad guy in the breast. She comes to a stop and regains her balance when the collision happens. When the effects of friction are taken into account, we may be confident that the following will be true: The kinetic energy is conserved. O Momentum and kinetic energy are not conserved. Both the energy and the motion are maintained. The momentum may be maintained.