Gravity x acceleration=weight

[ryan2006]

Measuring gravity is deciding whether gravity is a wave or a particle or a gravity wave or a graviton first of all. By placing a pendulums and magnet that swing the pendulum back and forth on planets or moons with varied gravitational forces then you can deduce that the pendulums swing at different rates or speeds assume that because of the varied rates you can thus have acceleration you can use the equation to tabulate the weight of an object. In this experiment you would have to land a pendulum and magnet on all the planets to prove the theory? Or could you experiment with simply knowing that 9.8m/sec2 divided by 1/6 the gravity of the moon is the rate of the speed of gravitational force on the moon x the pendulum and magnet compared rates to equal the weight of an object. Understand or too confusing and not articulated enough. I welcome your kind responses.

[Endy0816]

Well the mass of the moon and its radius are different.

 

F(weight) = ma = (Gm₁m₂)/r²

 

Mass_Moon/radius_Moon² = 1/6 approximately

Mass_Earth/radius_Earth²

[tarimshahab]

I'm not sure exactly what you are asking.

For your pendulum experiment, yes you could use that to find the acceleration due to gravity by using the following pendulum equation:
T = 2*pi*sqrt(L/g). where T is the period of the swing, L is the length of the pendulum, and g is the acceleration of gravity
Isolated for g gives:
g = L*(2*pi/T)^2
Once you know g, you can use weight = m*g, to find the weight on different plantets.

If however, you know that the gravity is 1/6 the gravity on Earth, then you can just measure the weight on Earth, and divide by 6.

[Enthalpy]

Measuring gravity is deciding whether gravity is a wave or a particle or a gravity wave or a graviton first of all.

Eeeh?

 

Back to measuring gravity: a pendulum works, scientists and navigators did it on Earth centuries ago, and observed the variation from 9.77 to 9.83m/s². This could be done on other planets and moons. But why? Presently, we have accelerometers much more robust and convenient than an accelerometer. Better: we send space probes passing by celestial bodies or orbiting them before we send probes landing on them, and orbiting gives a measurement hugely more accurate.

[imatfaal]

Eeeh?

 

Back to measuring gravity: a pendulum works, scientists and navigators did it on Earth centuries ago, and observed the variation from 9.77 to 9.83m/s². This could be done on other planets and moons. But why? Presently, we have accelerometers much more robust and convenient than an accelerometer. Better: we send space probes passing by celestial bodies or orbiting them before we send probes landing on them, and orbiting gives a measurement hugely more accurate.

 

"Presently, we have accelerometers much more robust and convenient than an accelerometer." Those accelerometers are just rubbish and brilliant.

 

Aside from me being silly pointing out a typo - sorry I cannot help it. Orbits help us measure the mass of the planet - but g varies all over the world (height above average, composition of rocks etc) so the best way is still a local observation to measure g, whether by earthbound experiment or satellite reading

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[imatfaal]

!

Moderator Note

 

hoola I split your post off to a new thread. Please try to stay on topic - we have enough room for new threads and prefer to keep threads focussed on the op.