How to use a spring balance in space?

In summary, a spring balance cannot be used to measure the weight of anything under the conditions of a space shuttle. Is there any way you might use a spring balance to compare the 'heaviness' of twin babies born on the shuttle?
  • #1
reganw
19
0
A spring balance cannot be used to measure the weight of anything under the conditions of a space shuttle. Is there any way you might use a spring balance to compare the 'heaviness' of twin babies born on the shuttle? Discuss.


I don't know how you'd use a spring balance in the shuttle.. Any suggestions?
 
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  • #2
Sure.

Just use the scale, maintained at a constant force, to accelerate the babies across the room.

Measure average velocity, compute acceleration. Force and acceleration give you mass.

It may take a bit of practice to be able to hold a constant force on the scale but it can be done.
 
  • #3
Integral said:
Sure.

Just use the scale, maintained at a constant force, to accelerate the babies across the room.

Measure average velocity, compute acceleration. Force and acceleration give you mass.

It may take a bit of practice to be able to hold a constant force on the scale but it can be done.

So to maintain the scale at a constant force, you mean apply pressure to the scale myself, sit the baby on it and let go so that the baby would accelerate?
 
  • #4
perhaps a less harmful way would be to accelerate the spaceship at a constant acceleration. (for convenience let's accelerate the spaceship at 9.8ms^-2)
This acceleration would mean the conditions in the spaceship are identical to those in a gravitational field, the the spring balance would work fine.
 
  • #5
Oh okay, thank you to the both of you, you've been very helpful :)
 
  • #6
Instead of flinging babies around the cabin at the end of a spring, consider that springs with a mass load also oscillate about an equilibrium point given a little nudge.
 
  • #7
question kind of resembles the famous 'barometer' question dismissed by Bohr in his school examination...
why don't we go to the pilot of the space centre and say "I'll give you this nice spring balance if you tell me how heavy this baby is"

..by the way, i think gneill's solution is the best - by far the easiest to actually achive...although you physically can't get away from the fact that the baby's mass will be measured in terms of 'k' the spring constant..but that's ok
 

1. How does gravity affect the use of a spring balance in space?

In space, there is no gravity or very little gravity, so it does not affect the use of a spring balance. The spring balance can still measure the weight of an object, but it may not be the same as on Earth due to the lack of gravity.

2. Can a spring balance be used to measure the weight of an object in space?

Yes, a spring balance can still be used in space to measure the weight of an object. The spring balance uses the principle of Hooke's law, which states that the force exerted by a spring is directly proportional to the distance the spring is stretched or compressed. Therefore, it can accurately measure the weight of an object in space.

3. How do you calibrate a spring balance for use in space?

A spring balance can be calibrated for use in space by adjusting the spring's stiffness or the distance between the hook and the scale. This can be done by stretching or compressing the spring with known weights and making sure the scale reads accurately. It is important to calibrate the spring balance before use to ensure accurate measurements.

4. Can a spring balance be used to measure the mass of an object in space?

No, a spring balance cannot measure the mass of an object. It can only measure the weight, which is the force exerted by an object due to gravity. In space, there is no or very little gravity, so the weight and mass of an object are not the same. To measure the mass of an object in space, a different instrument, such as a balance scale, would need to be used.

5. Is there a limit to the weight that a spring balance can measure in space?

Yes, there is a limit to the weight that a spring balance can measure in space. Just like on Earth, the spring balance has a maximum weight capacity, and if the weight of an object exceeds this limit, the spring may become permanently stretched and no longer provide accurate measurements. Therefore, it is important to use a spring balance with an appropriate weight capacity for the objects being measured in space.

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