What's a Newton balance?

Answer 1

There's no such thing, are you thinking of a Newton Cradle?

A desktop toy from the 70's?

http://images.google.co.uk/imgres?imgurl=http://files.turbosquid.com/Preview/Content_on_2_16_2005_10_51_30/Newton%27s%2520Cradle.zip_thumbnail1.jpg36f9ca0c-c130-4959-af21-ae0c7bdcebe5Large.jpg&imgrefurl=http://www.turbosquid.com/FullPreview/Index.cfm/ID/254613&h=400&w=400&sz=18&hl=en&start=2&tbnid=au7IxQ9e20V1MM:&tbnh=124&tbnw=124&prev=/images%3Fq%3Dnewton%2Bcradle%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DN

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Answer 2

Basic Principles. Gravity surveying is based on Newton's Universal Law of Gravitation-The force of attraction between two bodies of known mass is directly proportional to the product of the two masses and inversely proportional to the square of the distance between them. This is shown by the formula:

Where M and m are the two masses, r the distance between them and G =6.67 x 10-11 Nm2kg-2 the gravitational constant.

There are several methods of detecting changes in gravity.

Measuring Gravitational Changes.

Spring Based Gravimeters. W=mg (Weight = Mass x Gravity). If a constant mass is used and there is a change in gravity, the weight will change. As Weight = Force (W=F) the Newton balance will change accordingly, i.e. if there is an increase in gravity the Newton balance spring will extend more. The force can then be calculated using Hooke’s Law: F =kx where k is the spring constant and will be known and x is the extension of the spring.

The mass is balanced by the spring until there is a change in gravity causing the weight to increase or decrease and re adjusts the spring.

Answer 3

newton's balance.

newton's third law of motion stated that, "in every action, there is reaction." it was proven experimentally when i was in high school. we can see this clearly if we can imagine all the forces acting in one body and draw it out. physicians called it free body diagram.

http://en.wikipedia.org/wiki/Free_body_diagram

we can see that in a free body diagram, a body will not move as long as there is no "external force" act upon the body. this is clearly justify the newton's first law of motion "an unmoving body will remain unmove and a moving body will remain moving with a constant velocity if there is no external force act upon it."

newton balance actually can be explain using newton's first, second and third law of motion and the newton's gravitational law.
newton's law of motion can be use to explain about the relation between forces and masses balance while the newton's gravitational law can be use to explain the relation between masses and masses balance.



regards.

Answer 4

A spring with a given force constant who's extension is calibrated in Newtons (units of force) Hookes Law- 'ut tensio sic vis' Gosh you still using them?

Answer 5

its the same as a newton meter which measures the force exerted on a mass

http://en.wikipedia.org/wiki/Spring_scale