Please describe a constant in an experiment.

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1. something that does not change. For example it might be the ratio of weight to mass on earth.

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posted by Damon
2. Could that really be an experiment?

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3. Sure
F = m a
on a flat horizontal greasy table pull an object with a spring and measure the force and acceleration
then mass * a = measured force
or mass = measured force/measured a

now hang the mass from the same spring and measure the force
we know the mass from our earlier experiment
so
measured Force = weight = mass * something

that something will be the same for various sized and densities of objects as I repeat the experiment
we call it the constant g which on earth is about 9.81 m/s^2

On Moon that constant will be about one sixth of its value on earth
BUT
Newton says they are related by a more general constant, the Gravitational constant G
where
F = G M1 M2 / distance between^2

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posted by Damon

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