In class we completed an investigation of Newton's Second Law. Most of the data supported the fact that as the mass of the cart increased, the acceleration of the cart decreased. Most of our data indicated that there was a lot of error in the calculated Net Force on the cart and the Theoretical Net Force acting from the mass hanging off the pulley.
Why was there so much error?
Could we do a new experiment to account for this error?
What would that experiment look like? What could we add to the procedure?
Paige hasn't done this lab yet. I need all of you in this class to be involved in a discussion about this topic. Everyone must comment at least once on the questions above by this Friday. Next week we will comment more and develop an experiment for her to do.
Here is where we will discuss this.
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ReplyDeleteI don't understand what you mean by copy someone else's experiment. How could copying someone else's work tell you how much friction you had?
ReplyDeleteI agree that looking online may be helpful in figuring out how to find the amount of friction.
Change the weighting around so there is less friction. Find a smaller car, use a smaller weight on the end of pulley and use smaller weights that go on top of the car to lessen the amount of friction.
ReplyDeleteFind a formula that will account for the friction so we can add it to the results to make them more accurate.
ReplyDeleteLet's continue with the finding how much friction idea. We are not going to be able to eliminate it, so let's find it!
ReplyDeleteTo reduce the friction we need to figure out how much there is and where it occurs. There was friction between the pulley and string, tires and table and the tires and axel. Would taking into account how much area the friction occurs on (ex. the wheel is 1cm wide and when standing upright, the wheel touches 1.5 cm on the table) need to be taken onto account? The force the friction has would be done in a formula and that would be taken to account when figure out the Newton's of the cart.
ReplyDeleteLook up a formula on the internet and use it to find how much friction you have. You could use a different object that has a smaller area and not as many areas of friction.
ReplyDeletePaige should use a certain amount of grease or vaseline that could be smothered all over everything that is used in the expirement so very little friction is there and the expirement will be much more accurate
ReplyDeletealso when using the car the amount of friction on it varies directly to the amount of weight pushing down on the car. So if Paige were too use the same amount of weight variation in each test (ie. 100g added to every test) instead of jumping around she would be able to see how accurate her results are by the curve of her graph. The curve of the graph using this would also show her how much error she had since the difference should be simular between each test.
ReplyDeleteThe desks we used as a surface for our experiment were scratched and carved up from students. To reduce the amount of friction in her experiment, Paige should use a smooth surface to run her cart along. A surface of lead would be preferable :)
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