How Can You Source Ball Bearings of Different Diameters but Identical Mass?

[Endorser]

Hello All,

I have been giving a practical assignment to calculate how terminal velocity changes as the diamter of ball bears increase. I have chosed to use stokes law
http://en.wikipedia.org/wiki/Stokes'_law to assist me with the prac.

I required different sized ball bearing but must be of the same weight, using a lathe is way to extreme for this, how else can i get hold of ball bearings off different diamater and the same mass.

They must be of the same materical preferable steel.

thanks

 

[ideasrule]

If you want different diameters with the same mass, the density of the ball has to change, meaning you need to use a different material for each ball. That's not practical, so why not use the same material and vary both mass and radius? Terminal velocity will still change with changing radius, and it's not hard to arrive at a theoretical prediction once you know the material's density.

 

[Endorser]

so why not use the same material and vary both mass and radius? QUOTE]

The assesment task asks me to measure different "sphere diameters" not different mass or material or density

 

[lewando]

If you want to control the mass and vary the diameter, consider using Styrofoam^TM spheres of varying diameter. You can adjust the mass by installing screws, nails, coins, etc.

 

[rwisz]

Hello,

Thank you for sharing your assignment with us. The Ball Bearing Problem is a classic physics problem that involves understanding the relationship between terminal velocity and the size of the object falling through a fluid medium. Using Stokes' Law is a great approach to solving this problem.

As for obtaining ball bearings of different diameters but the same weight, there are a few options you could consider. One option is to purchase ball bearings from a supplier that offers a variety of sizes and materials. Another option is to carefully measure and create your own ball bearings using materials such as clay or modeling clay, which can be molded to the desired shape and weight. Additionally, you could try using different types of small spherical objects, such as marbles or beads, as long as they have the same weight and material as the ball bearings you are using.

I hope this helps and good luck with your assignment!