True/False relating to Work

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In summary, work is defined as the change in energy, and cannot be done without motion. In a frictionless system, the sum of potential and kinetic energies is constant, and energy is required to do work. This is demonstrated by the fact that less power is needed to slowly lift an object compared to lifting it quickly. The statement that work is only done when the form of energy changes may be considered true in certain contexts, but is not a general statement.
  • #1
nicknaq
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Homework Statement


Work is done when the form of energy changes.
Work cannot be done in the absence of motion.
Energy conservation law for a projectile (no friction): Potential energy increase equals the kinetic energy decrease.
Without friction, and in the absence of external forces, the sum of the potential and kinetic energies of a body is constant.
Energy is required to do work.
Less power is required while slowly lifting a box than while lifting it up quickly.
Problem Weight is: 1


Homework Equations





The Attempt at a Solution


I thought they were all true except for the first one. But that isn't correct. Thanks!
 
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  • #2
That first statement is a bit ambiguous:
nicknaq said:
Work is done when the form of energy changes.
Strictly speaking, this is equivalent to "If the form of energy changes, then work was done." Which is not true as a general statement, but depending on the context of your course may be considered true in some limited sense.

The other statements are less ambiguous and are true, so I suspect your book wants you to treat this as true as well.

What book are you using?
 
  • #3
Doc Al said:
That first statement is a bit ambiguous:

Strictly speaking, this is equivalent to "If the form of energy changes, then work was done." Which is not true as a general statement, but depending on the context of your course may be considered true in some limited sense.

The other statements are less ambiguous and are true, so I suspect your book wants you to treat this as true as well.

What book are you using?

They're all true. Thank you for the help once again.
It's Physics for scientists and engineers
 
  • #4
nicknaq said:
It's Physics for scientists and engineers
Who's the author? Fishbane, et. al.?
 
  • #5
Doc Al said:
Who's the author? Fishbane, et. al.?

No, it is authored by Serway and Jewett.
 

What is the difference between true and false in the context of work?

True and false in the context of work refer to the accuracy or validity of a statement or claim. A true statement is one that is supported by evidence or facts, while a false statement is one that is not supported by evidence or is contradicted by facts.

Can true or false statements impact work performance?

Yes, true or false statements can have a significant impact on work performance. False information can lead to mistakes, misunderstandings, and poor decision making, which can ultimately affect the quality and efficiency of work. It is important to verify the accuracy of information before using it in the workplace.

How can one determine if a statement is true or false in the workplace?

In the workplace, determining the truthfulness of a statement can be done by researching and gathering evidence to support or refute the claim. It is also crucial to consider the credibility and reliability of the source of the information. Collaborating with colleagues and seeking their perspectives can also help determine the truthfulness of a statement.

What are the consequences of spreading false information in the workplace?

Spreading false information in the workplace can have severe consequences, including damaging the trust and credibility of the person spreading the information, creating conflicts and misunderstandings among colleagues, and negatively impacting work performance. It is essential to fact-check information before sharing it with others.

How can one avoid making false statements in the workplace?

To avoid making false statements in the workplace, it is crucial to verify the accuracy of information before using it. This can be done by conducting thorough research, consulting reliable sources, and seeking feedback from colleagues. It is also essential to be honest and transparent in communication and to correct any mistakes or misinformation as soon as possible.

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