course phy 201
Experiment 4- When does a steel ball on a ramp start slipping?From the first part of the experiment we determined that there was some slipping at 13.1 cm because the steel ball did not go through the same number of rotations that it went through fot the other trails at smaller slopes.
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We then set up the ramp so that when the ball got to the end of the ramp, it would roll off the table and hit the floor where we taped a piece of paper with blue carbon paper so that we could see exactly where the ball first hits the floor.
The ball is pretty consistent with hitting the same place every time it is rolled off at the same slope. We measured the distance from the place the ball would hit the floor if it was dropped straight down from the end of the ramp.
dy (height of ramp off the table)- distance on floor
10.6cm- 39.9cm
11.1cm- 40.4cm
12.1cm- 41.2cm
13.1cm- 42.2cm
14.1cm- 42.8cm
15.1cm- 43.8cm
So, I do not see a big change in the distances that the steel ball travels when it is supposed to be slipping and those that it is not slipping, but I think the next step is to calculate the velocities for each slope.,"
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The Data Analysis Program you have used for some of the labs can be used to find the velocities from the horizontal range, distance of drop and slopes. Load the program (either go to one of the labs that use the program or use the address http://www.vhcc.edu/dsmith/genInfo/labrynth_created_fall_05/levl1_15/levl2_51/dataProgram.exe ).
Click on Experiment-Specific Calculations and choose #1. When requested, enter:
a. the distance of the fall,
b. the horizontal range, and
c. the equivalent number of dominoes (this will be slope * hypotenuse / (.9 cm), where the hypotenuse is that of the triangle running from where the domino stack touches the ramp to the table beneath that point, then to the point where the bottom of the ramp touches the tabletop).
The program will give you the velocity of the ball as it leaves the ramp.
When you have the ball velocity for each slope, calculate the acceleration along the ramp for each slope.
If there is no slipping, and if frictional losses due to rolling friction are neglected (frictional losses are probably negligible at this level of precision), then the acceleration should be proportional to the weight component parallel to the incline. This would result in a linear graph of accel vs. parallel weight component. Slipping will cause additional acceleration, and a graph of acceleration vs. parallel weight component will deviate from linear.