Why is the system not considered isolated in this scenario?

In summary, the conversation discusses the question of whether a block is isolated or non-isolated and what forces are acting on it. The correct answer is non-isolated due to the presence of external forces such as gravity and friction. The block is affected by gravity which gives it weight, and friction is an external force related to the weight. The block is also decelerating due to friction on a horizontal surface. The forces acting on the block are not internal, but rather external.
  • #1
jack1234
133
0
For the following question, the answer given is b. Non-Isolated

http://tinyurl.com/2s3waq

But may I know why it is not a. Isolated?
 
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  • #2
If is non-isolated, it certainly can't be isolated.

What forces are acting on the block?
 
  • #3
Astronuc said:
What forces are acting on the block?

One of them is friction force, the other one not sure...

By the way, from the other sources, I found the answer is a, I am really confused now, what is the correct answer??
 
  • #4
Hmm, can anybody shed me some light?
 
  • #5
The correct answer is non-isolated, because the block is affected by gravity which acts on the mass of the block giving it weight. In turn, friction is an external force related to the weight.

On a horizontal surface, the only way the block could be moving is to have had an external force applied to it. If the driving force has been removed, it must be decelerating due to friction.

The forces are not internal to the block.
 
Last edited:
  • #6
If the "system" had been the block and[\b] the surface, then the system would be isolated (since the surface is horizontal, gravity only acts to affect friction so doesn't have to be considered as a separate force).
 

What is an isolated system?

An isolated system is a physical system that does not interact with its surroundings in any way. This means that no matter, energy, or information can enter or leave the system. It is a theoretical concept used in physics to simplify complex systems.

Can an isolated system exist in real life?

No, it is impossible for a system to be completely isolated from its surroundings. All systems are affected by external factors such as gravity, temperature, and electromagnetic fields. However, some systems can be considered isolated if the interactions with their surroundings are negligible.

What are some examples of isolated systems?

An example of an isolated system is a thermos, which is designed to minimize heat transfer between its contents and the surrounding environment. Another example is a planet in space, where the interactions with other celestial bodies are very minimal.

How is an isolated system different from a closed system?

A closed system can exchange energy but not matter with its surroundings, while an isolated system cannot exchange either energy or matter. Closed systems are commonly used in thermodynamics to study energy transfer, while isolated systems are used in theoretical physics to simplify complex systems.

What are the implications of an isolated system in scientific research?

The concept of an isolated system allows scientists to study the behavior of a system without the interference of external factors. It allows for the development of fundamental laws and principles that can be applied to more complex systems. However, it is important to note that in practical applications, systems are never truly isolated, and their behavior may differ from theoretical predictions.

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