Ticker Timer Lab – Changing Velocity
Ticker Timer Lab – Constant Acceleration
Procedure:
1. Gather 2 m of ticker timer tape and a meter stick.
2. Place the ticker timer 2 m above the floor.
3. Tape a weight to the end of the ticker timer tape and run the tape though the ticker timer.
4. Hold the tape steady and start the ticker timer.
5. Let the weight fall, pulling the tape through the timer.
6. Measure the distance between every 6 dots. How much time does this represent?
PART 1
Data (distance and time):
|# dots |Time ( ) |Distance ( ) |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
Graphing (d vs. t):
1. Create a distance vs. time graph from your data from the falling weight. Draw a best fit curve through your data points.
2. From this curve find the instantaneous velocities of 5 different times. Remember that the velocity of an object is the slope of a d vs. t graph. To find the instantaneous velocity of any point you can draw a tangent line at that point and calculate its slope.
3. Do all of your work on your graph. Record your data.
PART 2
Data (velocity and time):
|Slope = rise/run ( ) |Velocity ( ) |Time ( ) |
| | | |
| | | |
| | | |
| | | |
| | | |
Graphing (v vs. t):
1. Create a velocity vs. time graph from your data. Draw a best fit line through your data points.
2. Determine the slope of this graph. Record your results.
Slope = rise = ________ =
run
Questions:
PART 1 (d vs. t)
1. What type of relationship does your d vs. t graph represent?
2. Did the weight fall at a constant velocity? How do you know?
3. a) What does the slope of a d vs. t graph represent?
b) Is this true for a curved graph as well as a straight line? Explain.
4. What caused the weight to move?
PART 2 (v vs. t)
5. What type of relationship does your v vs. t graph represent?
6. a) What is the slope of your v vs. t graph?
b) What are the units of this value?
c) What does it represent?
7. If the weight were traveling at a constant velocity, what would be the slope of this graph? Describe it.
8. What are the units for the area under a v vs. t graph?
9. a) Find the area under the graph from t = 0 to t = 0.5 s. (area of triangle = ½ base x height)
b) Look at your d vs. t graph. How far did the weight travel in 0.5 s?
Conclusions:
State:
1. What the slope of a d vs. t graph represents.
2. What the slope of a v vs. t graph represents.
3. What the area under a v vs. t graph represents.
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