Rebound+Analysis

toc

Variables:
=Independent Variable:=

The balls are all the same size and mass; the balls are dropped from the

 * Same height (400cm); the same measuring tool will be used for each trial.**
 * The frozen ball will be put back into the freezer after each trial.The refrigerated ball will be put back into**
 * the refrigerator after each trial. The room temperature ball will be returned to the room (B-37).**


 * The balls were each massed. The average mass was 25.30g.**
 * Frozen (#1= 24.1g), cooled( #2 =26.2g,),**
 * room temperature( #3=25.8g)**


 * The circumference of each ball was 23.5cm.**

Temperature of the balls; one will be put in the

 * freezer 5 days; one will be refrigerated for 5 days;**
 * 1 ball will be left at room temperature for 5 days.**

General Plan:
**Potential Problems And Solutions:**

The frozen ball may shatter on impact.
**Safety Or Environmental Concerns: Clear the area when performing the experiment.**

Experimental Design:

 * = Controlled, manipulated experiment =
 * = Controlled, manipulated experiment =

What is your experimental unit?
Measurements will be taken of the rebound height of 3 balls; one frozen for 3 days; one refrigerated for 3 days; one kept at room temperature for 3 days.

Number Of Trials:
Each ball will be tested 6 times (6 trials).

Number Of Subjects In Each trial:
There will be one ball for each set of 6 trials; each set will use a ball of different temperature.

Number of Observations:
There will be 18 observations and recordingf data.

When data will be collected
Data will be collected during the second week of February, 2013.

Where will data be collected?
The data will be collected outside the science room. = =

= =

||

Help · About · Blog · [|Pricing] · Privacy · Terms · [|**Support**] · [|**Upgrade**] Contributions to http://mwvsciencefair.wikispaces.com/ are licensed under a [|Creative Commons Attribution 3.0 License].

Resources and Budget Table:

 * Item || Number needed || Where I will get this || Cost ||
 * //__balls__// || 3 || Ms. Cohl || $3.00 ||
 * ruler || 1 || Mr.Littlefield || free ||
 * tape || 1 || Mr.Littlefield || free ||

Detailed Procedure:
1. Purchase 3 'bouncy balls'. 2. Place one ball in the refrigerator freezer compartment. 3. Place one ball in the refrigerator. 4. Place one ball in a safe place in the classroom. 5. Leave the balls in place for one week. 1. Tape the tape measure to the wall, attaching it to the level of the rail. A measurement will be taken of wall height, from the top of the rail to the floor. Pieces of tape will be attached to the wall at regular intervals. 2. Assistant will stand on ground floor with camera and data chart. 3. Standing on the top floor, scientist will hold one of the balls in hand, straight out before him. 4. For each trial, scientist will let go of the ball. 5. Assistant will quickly note the rebound height measurement, and document it. 6. Use the data to create a graph showing the results of the experiment.
 * Part One:**
 * Part Two:**

Time Line
The trials were performed over a two week period.

Data Table:

 * || Frozen || Cooled |||| Room Temperature ||
 * Trial # 1 || 69cm  ||  1.40cm  ||  1.62cm  ||   ||
 * Trial # 2 || 79cm  ||  1.30cm  ||  1.60cm  ||   ||
 * Trial # 3 || 80cm  ||  1.40cm  ||  1.50cm  ||   ||
 * Trial # 4 || 75cm  ||  1.42cm  ||  1.42cm  ||   ||
 * Trial # 5 || 81cm  ||  1.25cm  ||  1.40cm  ||   ||
 * Trial # 6 || 78cm  ||  1.26cm  ||  1.40cm  ||   ||

=GRAPH OF RESULTS=

http://galileo.phys.virginia.edu/outreach/8thGradeSOL/EffectofTemperature.htm
**Abstract:**