group+001

 ** Pre-Lab: ** Overview: Our experiment will be an inelastic collision. We will have one person roller blading down a ramp and they pick up a heavy backpack. From this experiment, we will prove that the momentum before the roller blader grabs the bag is the same after the person grabs the bag.  Data Collecting: We will first need to find the masses of the person and the roller blades. Mass will be measured in kg. We also will need to find the velocity of the person on the ramp as he goes down. We will use Vivfdat and solve for Vf. We then can use the masses and velocities to solve for the before the collision momentum. We will find the velocity after the collision using Vivfdat also. We will find the momentum after the collision using the new mass and velocity. We also will factor the force of friction into our equations. Then, we will compare both momentums to see if the momentum was conserved. Data will be collected in an MVP chart. Safety Precautions: We need to make sure the second person doesn’t get hurt when roller blading.  Equipment: roller blades, stopwatch, calculator, meter stick, scale, heavy backpack

Mr. Eddy Says it is perfect. media type="file" key="Oct 08 to Jan 09 (Goodman Bar Mitzvah, Phoenix)001.mpg"This is the distance Stephanie traveled without the second mass. media type="file" key="Oct 08 to Jan 09 (Goodman Bar Mitzvah, Phoenix)002.mpg"This is the distance Stephanie traveled with the added mass.   || Trial 1 || Trial 2 || Average || || 13.50 seconds || 12.85 seconds || 13.18 seconds || || 11.77 seconds || 11.31 seconds || 11.54 seconds || Height of Ramp: 81 cm Length of Ramp 880 cm Ramp Angle: 6°
 * Data Collected:**
 * <span style="font-family: Arial,Helvetica,sans-serif;">
 * <span style="font-family: Arial,Helvetica,sans-serif;">Time Without Backpack
 * <span style="font-family: Arial,Helvetica,sans-serif;">Time With Backpack

Distance traveled without backpack: 964 cm Distance traveled with backpack: 648 cm (Distance between without backpack and with backpack: 316 cm)

To Find Ff: On Ramp: 61N Horizontal: 20N

We needed the masses of the backpack, Stephanie and the rollerblades Backpack: 10kg Stephanie with rollerblades: 59.09kg

Our Equations to solve to see if the momentum was conserved, which it should be. <span style="font-family: Arial,Helvetica,sans-serif;">MVP charts Before Collision After collision
 * || m || v || p ||
 * Stephanie and skates || 59.09kg || 1.51m/s || 89.2kgm/s ||
 * Backpack || 10kg || 0 || 0 ||
 * Total ||  ||   || 89.2kgm/s ||
 * || m || v || p ||
 * Stephanie, skates and backpack || 69.09 || .624m/s || 43.15kgm/s ||
 * Total ||  ||   || 43.15kgm/s ||

Our experiment is too see if momentum is conserved when a person rolls down a ramp and their mass is changed by using an inelastic collision. To collect our data we measured the time it took to come to a stop from the top to the bottom of the ramp. Afterwards we measured how long the ramp was and how high it was with a tape measure. We also used a protractor to find the angle of the ramp. By using newton scales we were able to pull someone in the rollerblades at a constant speed so we could find the force of friction. With the force of friction we could calculate the mu. We used the mu to calculate the force of friction while traveling down the ramp. With the friction we could solve for the acceleration down the ramp, and from there we used the ViVfDat equations to solve for final velocity at the bottom of the ramp. After we knew the final velocity we solved for the momentum while going down the ramp. After we had all our information for the ramp we calculated the momentum for the flat area. We used the final velocity from the ramp for the intial velocity in the flat area. With that we were able to calculate the momentum that our rollerblader had while carrying the backpack.
 * Procedure:**


 * Conclusion:**** Our experiment ended up having a 52 % error. The concept we had was to go down a ramp with roller-blades and then see if momentum would be conserved when a backpack was picked up. Unfortunately due to math error and procedure error we did not end up having the proper amounts in order to show that momentum was conserved. These issues were caused by many reasons. One reason could be that when we did the drag scale for force of friction it was hard to move at a perfect constant speed without going to much over the scale. Because of this, we most likely had wrong scale readings that would often change. Another way our report could have been the amount of trials. If we did more trials, our data could have been more accurate. Thirdly, Stephanie may not have gone exactly straight down the ramp each time because she can't control how perfectly straight she moved. Error may have been created when going down the ramp, the roller blades and the ramp did not necessarily force Stephanie downwards so she would have to scoot a little to find the right place that would make her go downwards. The place of start was not always constant due to the fact that there needed to be a little bit of scooting to create motion. **

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