Find work of an object at constant velocity

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SUMMARY

The discussion centers on the concept of work done on an object lowered at constant velocity. The total work done on the block is zero, as the work done by gravity and the work done by the hand are equal in magnitude but opposite in direction. The work done by gravity is positive, while the work done by the hand is negative. The block exerts an equal and opposite force on the hand, resulting in negative work done by the block on the hand.

PREREQUISITES
  • Understanding of Newton's Laws of Motion
  • Familiarity with the work-energy principle
  • Knowledge of force and displacement vectors
  • Basic grasp of positive and negative work concepts
NEXT STEPS
  • Study the work-energy theorem in classical mechanics
  • Learn about vector forces and their impact on work
  • Explore examples of work done in various physical scenarios
  • Investigate the implications of constant velocity on force interactions
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the principles of work and energy in mechanics.

lindsaybn10
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I lower an object at constant velocity.
What is the sign of the total work done on the block?
What is the sign of the work done by gravity on the block?
What is the sign of the work done by my hand on the block?
What is the sign of the work done by the block on my hand?


I know that work = Force * distance.

Any help is much appreciated!
 
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lindsaybn10 said:
I lower an object at constant velocity.
What is the sign of the total work done on the block?
What is the sign of the work done by gravity on the block?
What is the sign of the work done by my hand on the block?
What is the sign of the work done by the block on my hand?


I know that work = Force * distance.

Any help is much appreciated!

Welcome to PF! :smile:

Next time use the template provided and show your attempt of solution, please.

What determines the sign of work?

ehild
 

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