G
LAB:
1.
Experimentally determine the value of g (acceleration due to gravity). Use two methods:
a)How
height affects g. Dropping or throwing up an object a known distance and accurately
and precisely timing it. Make several trials at several different
heights.
To
use the Motion Detectors to help you, use pages 7778 in text as a guideline.
Notes:
 use a height of at least 25
meters. –start the dropping object from at least 20 cm away from the
motion detector. –use the trace function to copy down at least 5
(including starting and ending) distance/time points of each drop. –use
the analyze menu to select just the dropping region of the distance graph, then
sketch the distance, velocity and acceleration graphs, using the trace function
to find points and/or best fit lines/curves.
Remember
that the SLOPE of the (best fit line to the) Velocity Time Graph should give
you ACCELERATION.
–collect data in a neat and organized fashion, and
use it to produce a good conclusion as to the value of g.
Make a graph of height vs. ACCELERATION (g)
b)
how angle affects g. The RAMP method. Let something (car, ball, etc...) freely
roll down a ramp/driveway/air track. Do several trials at different lengths and
angles. Using the known distance and measured time, determine the acceleration.
D=1/2AT^{2}
Measure
the angle (use trig if needed, sine theta equals Vertical/Hypotenuse). Do it
again for another ramp, another angle... Make a graph of angle vs.
acceleration.
Extrapolate
on your graphs to find the acceleration (g) for 90 degrees!! –collect
data in a neat and organized fashion, and use it to produce a good conclusion
as to the value of g.
c) how some other factor of your choosing affects g (mass, surface area, type of material, etc…).–collect data in a neat and organized fashion, and use it to produce a good conclusion as to the value of g.
FOR
EACH EXPERIMENT, Each Individual Person should write a lab report.
Each
section should have:
A
problem statement
Procedure
Description
of experiment, variables, and why it was conducted well or poorly
Results,
with calculations and/or graphs
Conclusions:
On how close you came to the actual values, what your percentage error was,
what the sources of error might have been. (discuss accuracy AND precision).
G
LAB
1) x y
OBJECT DISTANCE
TIME ACCEL
(Height) (from formula and slope of
velocity time)
















D=1/2gT^{2}
^{ }
^{ SLOPE OF VELOCITY TIME GRAPH}
^{ }
2) RAMP LENGTH ANGLE TIME ACCEL
(x) (y)




















D=1/2AT^{2}
^{ }
^{ }
^{ }
^{ }
^{ }
^{3) ???}