spark timers another way to measure time.... the spark timer

Spark Timers Another way to measure time...

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Spark Timers

Another way to measure time...

The Spark Timer

Keeping Time

The spark timer makes sparks which leave dots behind on spark tape

The spark timer has two different settings (10 Hz and 60Hz)

Frequency is how often something happens over a time (typically per second)

10 Hz means 10 dots/s and 60 Hz means 60 dots/s

So… Spark timers make motion diagrams.

Page 4: Spark Timers Another way to measure time.... The Spark Timer

How much time?

To determine length of time for an event that is being timed with a spark timer, you count up the number of dots and divide by the frequency.

Page 5: Spark Timers Another way to measure time.... The Spark Timer

Getting Data From a Spark Timer

Time: dots/frequency Displacement: measure between dots Velocity: displacement/time Acceleration: Kinematics or velocity/time

the number of dots you use will depend on the event you are timing

Page 6: Spark Timers Another way to measure time.... The Spark Timer

Constant Velocity

Load the spark tape (about 8 inches long) shiny side up into the machine.

Choose 60 Hz Turn on the spark timer and pull the tape

through the timer at as close to a constant velocity as you can (slow constant velocity is best).

Once you pull the tape completely through the machine, turn off the machine

Page 7: Spark Timers Another way to measure time.... The Spark Timer

Spark Tape Analysis (Constant Velocity)

Glue the spark tape here

Are the dots roughly evenly spaced?

Determine the total time and measure the total distance between your first and last dots. Then calculate the average velocity

Page 8: Spark Timers Another way to measure time.... The Spark Timer

Acceleration

Load the spark tape (about 8 inches long) shiny side up into the machine.

Choose 60 Hz Turn on the spark timer and pull the tape

through the timer slowly at first then try to increase your pulling speed

Once you pull the tape completely through the machine, turn off the machine

Page 9: Spark Timers Another way to measure time.... The Spark Timer

Spark Tape Analysis (Acceleration)

Glue the spark tape here

Is there a region where the dots begin getting spaced further and further apart

Determine the velocity between two consecutive dots (initial velocity), then determine the velocity between a later pair of dots (final velocity). Determine the total time elapsed between the first dot of your first pair, and the last dot of your last pair. With this data calculate average acceleration

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