anonymous
  • anonymous
Which one of these motions is not at constant acceleration? - A rock falling from a cliff - A dish resting on a table - An elevator moving from the second floor to the fifth floor making stops along the way
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
because of air drag, first one is not constant and the third one is also not constant because it changes its speed among the way.
anonymous
  • anonymous
but there is only one answer to this problem?
anonymous
  • anonymous
it is probably last one, is not it ?

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anonymous
  • anonymous
hmm i dont know, would it be the 2nd bc its not moving at all
anonymous
  • anonymous
second one can not be i think. if we ignore air drag, first one is constant. Otherwise we have to accept that it is not constant acceleration. But it could be last one, if there is only choice.
anonymous
  • anonymous
no those are the 3 mult choices I need to pick one but cant figure it out
anonymous
  • anonymous
i meant that only one is correct. Think about first one. If there is air drag the acceleration changes in time. second one must be constant. third one is not constant as well. Because the elevator has to stop when reach fifth floor therefore its speed changes. So the acceleration changes as well. understood ?
anonymous
  • anonymous
yeah but I dont know which is correct but I do understand what you are getting at
theEric
  • theEric
You would question what constant acceleration means in an introductory course, and in an introductory course you usually neglect air drag (and changing gravity)! So, Neglect air drag (and changing gravity)! In free fall, we have a constant acceleration of about \(-9.81\ [m/s^2]\), or about \(-10\ [m/s^2]\). The negative means down, when we say up is positive. The dish on the table has no change in velocity with respect to time, so it has a constant \(0\) acceleration. The elevator is stopping and starting and stopping, maybe more starting and stopping! So it gains upward velocity to start moving - positive acceleration. Then it slows to a stop - the velocity becomes more negative so that is negative acceleration. It is apparent then, that acceleration is changing if it is going from positive to negative! Haha!
theEric
  • theEric
Any questions?
anonymous
  • anonymous
ohh so the answer would be the elevator bc of its movement, its stopping and going.. ect
theEric
  • theEric
Right. Its not gaining velocity at a steady rate. It's gaining and losing and gaining.. etc. :) Congrats@
theEric
  • theEric
Congrats!*
anonymous
  • anonymous
thank you so much! can you help me on these other 2 problems I have please?
theEric
  • theEric
Post them as separate questions so others can see to help! I can take a look, and help if they don't keep me from my homework too much!
anonymous
  • anonymous
okay thank you!

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