If I was you i would use millimetres or centimetres.
Grams
I would use a micrometer. A caliper would do as well.
What do you want to measure about the marble? Its diameter, radius, circumference, volume, mass, density...?
It would be the simplest way to do so.
Calipers would be accurate, a micrometer would probably be most accurate. there's a few options, depends on your purpose.
Grams
I would use a micrometer. A caliper would do as well.
milimetersMilliliter
That depends what aspect of a marble you want to measure, for example its diameter, its mass, its density, its color, etc.
millimetres or mm
Mass is measured in kilograms. Weight is measured in newtons. If you are asking which unit to choose to measure then mass of a marble, then you need to use the submultiple of the kilogram, the gram.
You can measure the speed of a marble by using a stopwatch to record the time it takes for the marble to travel a known distance. Divide the distance by the time to calculate the speed in units such as meters per second or feet per second. Alternatively, you can use a motion sensor or tracking software to measure the speed of the marble in real time.
What do you want to measure about the marble? Its diameter, radius, circumference, volume, mass, density...?
It would be the simplest way to do so.
Calipers would be accurate, a micrometer would probably be most accurate. there's a few options, depends on your purpose.
I would use a fabric tape measure.I would use a fabric tape measure.
There are several methods:From geometry and the formula for the volume of a sphere:Assuming the marble is a perfect sphere, the radius of the marble is one-half of the diameter, or width of the marble. Use the formula for volume,V = (4/3) pi r3where pi is approximately 3.1416 and can usually be found on a scientific calculator. R is the radius as mentioned before. The formula in text is "four-thirds times pi times the radius cubed." Make sure to do the cubing first.From the displacement the marble causes in water or other liquidyou can measure the volume of a marble by filling up a glass beaker to whatever amount you'd like,then you would see how much the water went up.and that would be you answerFrom the density of the marbleWeigh the marble and determine typical density of glass from available tables. As the density of the marble is found by the formulaDensity=mass/volume,divide the mass in grams by the density in gm/cm3 to determine the volume in cm3.