Question

I need help coming up a source of error for this like lab thing that we are doing class. So like we took this string with a rubber ball on it and the string went through a glass tube, and on the end of the string, so the like opposite end of where the ball (rubber stopper) is, we added different masses, or washers. THen, we spun the string horizontally. THis was like the uniform circular motion lab. So I 3 errors already, but I need one more...the ones I have are the timer (it was like super hard to start and stop where the revolution was starting and stopping)...um then I like had the string kept moving changing the radius...and then like how the movement wasn't always horizontal...so does like anyone have any ideas as to one more error? Thanks a mill mill!

Answer 1

The movement cant be horizontal, but is always at some angle. Knowing that angle and keeping it uniform is important.

Timer is one, of course, and the counting. Wondering if you timed one rev, or timed say ten revs and then divided by ten...there is a big difference in error.

Maintaining constant r is one.

Finally, the force of resistance between the string and the glass tube(were it makes a 90 degree turn) was neglected. That can be reduced if a nylon or propolene string was used, and the tip of the glass tube was lubricated.

Finally, the error in measuring mass, both on the revolving mass, and the weight holding the string down.

Answer 2

THANKS!!!!!!!!!!!!!!!!!