FIRST QTR LAB TITLE:
L5
-
GRAPHS OF MOTION FOR AN OBJECT MOVING WITH A UNIFORM ACCELERATION
PURPOSE OF LAB:
“To plot graphs of speed vs time and distance vs time, and to calculate the
acceleration of an object, by analyzing tapes made with a ticker-tape timer.”
METHOD & MATERIALS:
a)Test the timer by making a constant speed tape pulling the tape by hand. Report
problems like double dots or dots at edge of tape. Replace carbon disk as needed.
b)Make and save 2 good tapes(one for each of you) for falling masses of 100g & 200g.
DATA CHARTS:
a)Complete Data Charts for 22 dots, doing each chart for both the 100g & 200g tapes.
b)Record the distances between consecutive dots on the first chart for each tape.
c)For each tape generate the data for the second chart, which is the total distance
from dot “0” to the position of each of the next 22 dots.
CALCULATIONS:
EQUATIONS: Frequency-Period Relationship: T = 1/f
or
f = 1/T
For acceleration calculation: D = ½(at2) and so a = 2d/t2
DO FOUR GRAPHS: Plot each graph on a full side of graph paper.
Plot the data for the two charts for each tape so you have a v-t graph and a
d-t graph for both the 100g and 200g tapes. Our unit of time is the “dot” which
should equal 1/60 sec, since the frequency of the timer is 60 cycles/sec. Plot dot
number from 0 to 22 on the horizontal axis for each graph. For chart #1 the data
listed for the vertical axis represents the average speed for that dot of time. For
chart #2 the vertical axis variable is the total distance of fall up to that # dot.
AND
Calculate the acceleration on each tape twice, by using the distances to the 12th
and 15th dots. (The time to these dots are 12*(1/60)sec and 15*(1/60)sec.)
RESULTS:
1)Four graphs: v-t and d-t for both the 100g and 200g tapes.
2)The acceleration for each tape, calculated at both the 12th & 15th dot. (4 results)
DISCUSSION OF RESULTS AND CONCLUSIONS:
(This section must be in any lab report.)
QUESTIONS TO ANSWER:
1)What is the period of your
2)What quantity is the slope
3)Calculate the slope of the
4)What quantity is the slope
timer in seconds to 3 significant digits?
of the graphs of Vav vs time equal to?
better of your two Vav vs time straight line graphs.
at any point of your distance vs time graph equal to?