Problem 4 Why is the efficiency of a machi... [FREE SOLUTION]

Chapter 14: Problem 4

Why is the efficiency of a machine always less than one?

Short Answer

Expert verified

The efficiency of a machine is always less than one because real-world factors such as friction and energy loss ensure that the useful work output is less than the total work input.

Step by step solution

Understanding the Concept of Efficiency

Machine efficiency is defined as the ratio of the useful work output to the total work input. In mathematical terms, efficiency (E) is described by the equation E = (useful work output / total work input).

Accounting for Real-World Factors

In real-world applications, machines are subject to frictional forces, heat loss, and other forms of energy dissipation, which reduce the amount of useful work output. This means that some of the work input is always used to overcome these inefficiencies.

Comparing Output and Input

Since some input work is inevitably lost due to inefficiencies, the useful work output is always less than the total work input. Therefore, the efficiency (useful work output / total work input) will always be less than one.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Work Input and Output in Machines

When we dive into the realm of physics, we often encounter the concept of work, which involves applying a force over a distance. In the context of machines, work input is the amount of energy we put into the machine to get it to perform its task. This could be in the form of electrical energy, mechanical energy, or any other type.

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91影视

Why is the efficiency of a machine always less than one?

Short Answer

Step by step solution

Understanding the Concept of Efficiency

Accounting for Real-World Factors

Comparing Output and Input

Key Concepts

Understanding Work Input and Output in Machines

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