Physics Review Question Unit: Mechanics Year: 1991 Question#: 13 Question: What is the essential characteristic of an object at equilibrium. (1 ) Zero velocity (2 ) zero acceleration (3 ) zero potential energy (4 ) zero kinetic energy What is this question really asking? Explanation by: Jarrett sk [ Return to question menu ] Answer 1 Zero velocity INCORRECT An object can be at equilibrium and have a velocity. Remember Fnet = 0 when something is at equilibrium. return to top Answer 2 zero acceleration CORRECT An object at equilibrium cannot be accelerating or decelerateing. It must be moving at a constant velocity. Remember Fnet = 0 when something is at equilibrium. return to top Answer 3 zero potential energy INCORRECT An object at equilibrium can have potential energy. An example would be a marble moving at equilibrium on a table. The marble has PE to fall downward. Remember Fnet = 0 when something is at equilibrium. return to top Answer 4 zero kinetic energy INCORRECT An object can have KE (be in motion) and be at equilibrium. Remember Fnet = 0 when something is at equilibrium. return to top What's this question really asking? This question is asking about the proprties of an object at equilibrium. return to top |
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