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 77-78 in text as a guideline.

Notes:

- use a height of at least 2-5 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=1/2AT2

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=1/2gT2

SLOPE OF VELOCITY TIME GRAPH

2)                     RAMP                        LENGTH         ANGLE        TIME              ACCEL

(x)                               (y)

D=1/2AT2

3) ???