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Calculating the force required to move a golf ball up a ramp
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[QUOTE="Merlin3189, post: 6062223, member: 542077"] Hello and welcome to PF Your images have not shown up (to me at least). You may need to save on your computer as: png, jpg, jpeg, jpe, gif, Max width: 960 pix, Max height: 720 pix (Also accepted file types: zip, txt, pdf, docx, xlsx but I don't know if they display?) then use the upload button at the bottom and insert into your post. Some initial thoughts; A sketch (or more) of your design would be useful. Moment of inertia won't avoid the need to consider friction, because; The ball is going to slide (rather than / as well as) roll, as it is in contact with two surfaces . Moment of inertia (and linear inertia) will be less significant than weight and friction, if the ball is moved slowly. Though you may have to take these accelerations into account if you want to zip it up the ramp quickly. Depending on the way your mechanism works, you may be pushing horizontally or parallel to the ramp and you may not be pushing perpendicular to the motion in the horizontal plane. I haven't checked your calculations, but it looks as if you have the right sort of ideas (it's not worth checking until I see your diagrams.) But I would say that at this stage there is no need to use 3 or 4 sf. There are still a lot of uncertainties ( eg. friction, degree os sliding/rolling) so make life easy and get some ball park figures to maybe 2sf (and even just 1sf sometimes) to get a feel for the size of the issues. If μ turns out to be between 0.1 and 0.2 say, where does a mass to 4sf get you? When you have more data, do a more precise calculation and estimate the error margin or range of possible values. Be a bit wary of coefficients of friction and the Coulomb model in the context of plastics. But it's all you've got and at light loads with smooth surfaces, it should be good enough. You could do a few experiments* with whatever materials you have to hand. You may (?) find some useful values on the web. I think eventually you'll have to determine friction by experiment, using the materials and conditions of your prototypes. *Incidentally, if I were marking a project like this, I'd be very interested in how people did research like this. Irrespective of the quality of the final solution, I'd be giving credit for these parts of the project. Good luck with your project. [/QUOTE]
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Calculating the force required to move a golf ball up a ramp
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