Can someone explain this Energy Problem

In summary, the conversation revolves around the concept of total mechanical energy and its loss due to work done by other forces. The equation Wother=E2-E1 is used to calculate this loss, but there is confusion about its application in cases of frictionless systems. The example of a small spring and a ten-tonne truck is used to illustrate this confusion. The work energy theorem is also mentioned as a way to understand this concept, and the equation .5kx^2 = mgh is used to calculate the height reached by two blocks of different masses. It is clarified that as mass increases, height decreases, and the equation is confirmed to be correct.
  • #1
Lori
So- I'm going to confused with the concept of total mechanical energy that's loss due to work other. I provided an example below.

When do I apply this equation of Wother=E2-E2? I get confused cause I thought frictionless meant that energy is conserved.
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  • #2
Would you expect a small spring to be able to fire a ten-tonne truck as high as a marble?
 
  • #3
PeroK said:
Would you expect a small spring to be able to fire a ten-tonne truck as high as a marble?
I know that, but I want to understand it with the work energy theorem. I don't really understand it.
 
  • #4
Lori said:
I know that, but I want to understand it with the work energy theorem. I don't really understand it.

Why not calculate the height both blocks reach?
 
  • #5
PeroK said:
Why not calculate the height both blocks reach?
Is it .5kx^2 = mgh so h= kx^2 / 2mg

So when mass increases, height decreases?

Did i get the equation right ?
 
  • #6
Lori said:
Is it .5kx^2 = mgh so h= kx^2 / 2mg

So when mass increases, height decreases?

Did i get the equation right ?

Yes, that's it.
 

FAQ: Can someone explain this Energy Problem

What is the concept of energy?

Energy is the ability of a system to do work or cause change. It can exist in many forms, such as mechanical, thermal, nuclear, chemical, and electromagnetic.

What is an energy problem?

An energy problem is any situation in which there is a discrepancy between the amount of energy available and the amount needed to perform a desired task or achieve a desired outcome.

How do you solve an energy problem?

The first step in solving an energy problem is to identify the type of energy involved and understand its properties and behavior. Then, using relevant equations and principles, you can calculate the energy needed and compare it to the available energy to determine if a solution is possible.

What are some common energy problems in everyday life?

Some common energy problems in everyday life include high energy bills due to inefficient appliances or heating/cooling systems, running out of gas or electricity while using a vehicle or electronic device, and finding renewable energy sources to reduce dependence on fossil fuels.

How can understanding energy problems benefit society?

Understanding energy problems can lead to more efficient use of resources, reduced energy consumption and costs, and development of sustainable energy solutions. It also helps us make informed decisions about energy policies and conservation efforts to protect the environment.

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