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course Phy 201
6/8 9:30 pm
ExperimentDesign and conduct an experiment using a timer and a ball on a constant-incline ramp to
• Prove that when a ball rolls down the ramp, its average velocity on the 'second', or lower, half of the ramp is greater than on the initial half.
• Determine as closely as possible the ratio of the average velocity on the lower half to that on the initial half.
Materials and Measurements:
• Book as ramp ( 28.2 cm)
• Domino (.7 cm)
• Medium sized marble (1.6 cm)
• Marble size minus book size (26.6 cm is the initial start point)
• Half way on the book (13.3 cm)
• Post it note to mark half way point
• Timer
Details:
I performed four trials rolling a marble down an inclined ramp. I started the timer when the marble was released, and pushed the timer again when it reached the half way point and then again when the marble reached the end of the ramp.
Results:
(I went ahead and averaged out all of my times and here they are)
Average Roll Time First Half: 1.14 s
Average interval for First Half: 1.15 s
Average roll time for Second Half: .58 s
Average interval for Second Half: 59 s
Average velocity: time required to travel through known displacement
1st Half: 13.3 cm/ 1.15 s= 11.57 cm/s
2nd half: 13.3 cm/ .59 s = 22.54 cm/s
Averaged Rate at Which Velocity Changes:
Change in velocity/Change in time
(22.54 cm/s-11.57 cm/s)/(1.14 s-.58s) =( 10.97 cm/s)/(.56 s) = 19.59 cm/s/s
Average velocity change between the first in second interval= 22.54 cm - 11.57 cm = 10.97 cm
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&#Your work looks very good. Let me know if you have any questions. &#