Studying for test please confirm this

In summary, the conversation discusses how to use the concept of conservation of energy to find the velocity of a falling object in a given system. This can be done by equating the change in potential energy with the change in kinetic energy, and this equation holds for every point between the two limit positions. The speed is also independent of the object's mass. However, it is important to note that for any position in between, the equation PE=KE is incorrect, but the equation Total Energy=PE+KE is correct.
  • #1
onrytxn
4
0
For a given system in which energy is conserved, how do you use the concept of conservation of energy to find the velocity of a falling object, given its mass, original height of elevation, and the distance it has fallen?

Find Total Energy; @ high point PEmax=mgh; @btm point KEmax= ½ mv^2; equate PE=KE; @ a position in between Total Energy =PE+KE @ that point.

Does this sound right?
 
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  • #2
Yep, it does sound right to me. Just equate the change in potential energy (given that initial speed is zero) with the change in kinetic energy to get the speed. This equation then holds for every point between the two limit positions. Another nice result is that the speed is independent of the object's mass.
 
  • #3
For any position in between PE=KE is wrong. But total energy=PE + KE is correct for any point in the path.

As the question suggests all it's looking for is showing an understanding to TOTAL ENERGY=POTENTIAL ENERGY+KINETIC ENERGY at any point.

Best of luck for your exam :)
 

FAQ: Studying for test please confirm this

What are effective study strategies for preparing for a test?

Effective study strategies for preparing for a test include creating a study schedule, breaking up study sessions into smaller chunks, practicing active learning techniques such as summarizing and self-quizzing, and seeking help from a tutor or study group if needed.

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The amount of time you should spend studying for a test depends on the difficulty of the material and your own study habits. It is generally recommended to study for 1-2 hours for every hour of class time, but this may vary. It is important to start studying early and spread out your study sessions rather than cramming all at once.

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Is it better to study for a test in one long session or multiple shorter sessions?

Research has shown that studying in shorter, spaced-out sessions is more effective than studying in one long session. This allows for better retention of information and reduces the risk of burnout. It is recommended to break up your study sessions into 20-30 minute chunks with short breaks in between.

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