An elevator is hoisted by its cables at constant speed. Is the total work done on the elevator positive, negative, or zero?
Understand the Problem
The question is asking about the total work done on an elevator that is being lifted at a constant speed. The key concept here is to determine if this work is classified as positive, negative, or zero based on the principles of physics.
Answer
Zero
The final answer is zero.
Answer for screen readers
The final answer is zero.
More Information
When the elevator moves at a constant speed, the forces of tension and gravity are balanced, meaning no net force and hence no net work is done. Any positive work done by the tension in the cable is cancelled out by the negative work of gravity.
Tips
A common mistake is only considering the tension force and not the balance of forces involved.
Sources
- Q2DQ An elevator is hoisted by its ca... [FREE SOLUTION] - Vaia - vaia.com
- Work. Positive, Negative, or Zero - physicsforums.com
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