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- Thread starter drewman13
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mfb

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How do you "add" a force to an object?

Is this a homework question?

What do you expect?

Is this a homework question?

What do you expect?

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Baluncore

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While the force was applied the RPM would continuously accelerate.If there was a free-spinning effective weight of 20 lbs. at a 20" radius rotating at 180 rpm (15.7 fps?) and a force of 20 foot pounds was added, what would be the increase in velocity/speed?

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Thanks for the reply... I guess I am not good at stating the problem, sorry for the lack of Engineering savvy....Assume for illustrative purposes that 20 pounds was added to the downstroke for a distance of one foot and was removed immediately after that one foot of distance. What I am, basically, looking for is the effect on one rotation. Specifically, I wish to find out what is the maximum gain in velocity from that one input of 20 foot lbs. for one revolution.While the force was applied the RPM would continuously accelerate.

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mfb

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You should consider using SI units, as imperial units are just a huge mess if you want to calculate anything.

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Baluncore

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What is a “downstroke”? Is this a vertical axis or horizontal axis rotation?Assume for illustrative purposes that 20 pounds was added to the downstroke for a distance of one foot and was removed immediately after that one foot of distance.

Your title “Velocity / Speed loss by shifting to a larger radius.” is incompatible

with your OP question “ … , what would be the increase in velocity/speed? ”.

You are using scientific terms in inapplicable ways. That makes for total confusion.

You need to describe the physical system more completely.

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Thanks for that. I am sure you are right about SI units. My goal was just to see if I could get a hard number for mps or fps or rpm that resulted from the energy input to the vertical rotation. Assuming 180 rpm of original speed . (I added downstroke to imply vertical rotation). My degree is in Communications, (Graduated with Honors). I am much better with words than numbers, although Baluncore is correct that I made quite a few errors in my statement of the problem, including the OP Question. Currently, I am going through a health condition that reduces my cognitive skills. Originally, I attempted to become an Engineer but I quickly learned I am incapable of doing the math. This is one of the few places I can go with help on my inventions when I get stopped by the math. I, literally, would not have a clue as to do what you suggest, even though it is obviously the way to go. Let me know if you know of anywhere I can get something like this calculated, even if it is for a fee. Just need to keep it reasonable. Thanks.

You should consider using SI units, as imperial units are just a huge mess if you want to calculate anything.

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