roshni+and+jillian

pupose: To determine the acceleration of an object in free fall due to gravity.

hypothesis: If a weight attached to the end of a ticker tape is left to free fall, then the acceleration that is calculated will be 9.81 m/s squared.

materials: Ticker tape timer, Timer tape, Masking tape, Mass, Clamp, Meterstick

procedure: 1. Attach the spark timer to the cabinet door with the ticker tape in it 2. Put a weight on the end of the ticker tape 3. Set the time to 60 Hz 4. Let the weight drop, and the tape go straight through the spark timer 5. Record the length of each dot from 0 6. Create a graph using the data 7. Calculate the value of g


 * DATA** **need units in headings**

results are not very good!
 * GRAPH**


 * DISCUSSION QUESTIONS**

1. Does the shape of your graph agree with the expected graph? Why or why not? The curve on our graph was not as steep as the expected graph because it went slower than it actually would in free fall. A couple of factors caused this, such as the tape hitting the cabinet on its way down and us holding the tape back a little bit while it was falling.

2. How do your results compare to that of the class? Our experimental value for g was 504.96. This was a lot lower then the rest of the classes. The theoretical value of g is 981. |experimental-theoretical|/ theoretical X 100. Our percent difference is 48.5%. It is so high due to the factors listed in question 6. need to quantify "a lot lower than rest of class'"

3. Did the object accelerate uniformly? How do you know? The object did accelerate uniformly because on the tape, the dots get spaced farther apart in a constant manner. In addition, our graph shows a curve that gets steeper at an almost exponential rate.

4. What should the velocity - time graph of this object look like?
 * It should be an increasing line with a positive slope, with the same area as our PT graph.

5. Write the expected equation of the line from this VT graph (use specific information from your XT graph) the slope should be the acceleration

6. What factor(s) would cause acceleration due to gravity to be higher than it should be? Lower than it should be?
 * Higher - Our calculations might have been wrong. not a valid source of experimental error
 * Lower - One possible way the acceleration might have been slowed down was the way we were holding the ticker tape. Because there was was some friction created as it slid down between my 2 fingers, the acceleration might not have been as fast as it normally would've been if it was truly freefalling.

missing conclusion!