Weight vs Mass On Moon and Mars Imperial Units

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SUMMARY

The discussion focuses on the distinction between weight and mass in the context of the Moon and Mars using imperial units. It establishes that weight (lb-f) is dependent on gravitational acceleration, which varies by celestial body, while mass (lb-m) remains constant. Specifically, the Moon's gravity is 5.31 ft/sec², resulting in a weight of 3.5 lb-f, while Mars has a gravity of 12.1 ft/sec². The gravitational constant (gc) for Earth is defined as 32 lbm*ft/sec², which is crucial for converting between weight and mass in imperial units.

PREREQUISITES
  • Understanding of gravitational acceleration and its impact on weight
  • Familiarity with imperial units, specifically lb-f and lb-m
  • Knowledge of the gravitational constant (gc) and its application
  • Basic physics concepts regarding mass and weight
NEXT STEPS
  • Study the conversion between weight and mass using the gravitational constant (gc)
  • Learn about gravitational acceleration on different celestial bodies
  • Explore the implications of using imperial units in physics calculations
  • Investigate the differences between lb-f and lb-m in various gravitational fields
USEFUL FOR

Students studying physics, educators teaching gravitational concepts, and anyone interested in understanding the application of imperial units in different gravitational environments.

BigJon
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Homework Statement


Moon's gravity is 5.31ft/sec^2 An object has the weight of 3.5 lb-f on the moon. What is its lb-m
What is the lb-m and lb-f on Mars with gravity of 12.1 ft/sec^2.


Homework Equations


w=mg=mg/gc

gc= gravitational constant----> 32lbm*ft/sec^2 for earth

The Attempt at a Solution


So I understand mass is the same everywhere. Also lb-m and lb-f are the same numerically on Earth but not on other planets?

Im just really confused with imperial units because i don't understand when to use or not use the gc.
 
Physics news on Phys.org
## 1 \ \text{lbf} = 32.174 \ \frac {\text{ft} \cdot \text{lbm}} {\text{s}^2} ##.
 

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