In which situation does a scale read zero during an elevator ride?
Understand the Problem
The question is asking about the conditions under which a scale would show a reading of zero during an elevator ride, specifically focusing on different states of the elevator's motion.
Answer
During free fall.
The apparent weight on a scale reads zero if the elevator falls freely, such as in free fall, because neither the person nor the scale can push against each other.
Answer for screen readers
The apparent weight on a scale reads zero if the elevator falls freely, such as in free fall, because neither the person nor the scale can push against each other.
More Information
In a freely falling elevator, both the person and the scale are accelerating at the same rate due to gravity. Therefore, the normal force, which the scale reads as weight, is zero.
Tips
Confusing acceleration with constant velocity can lead to mistakes. Remember, weight is only zero in free fall, not merely downward acceleration.
Sources
- Cutnell Physics - WebAssign - webassign.net
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