Sports+Science-GBS+Edition



Group Members: Paul Masini and Justin Ruderman __**Lab Goal:**__ To see how velocity affects the force a football player hits.


 * __Procedure:__**

1. Press "Collect" on LoggerPro and have Paul run at me at a designated pace. 2. Collect force Paul exerted and the time it took him to run. 3. Use the equation D=V/T to find out the velocity he was traveling at. 4. Record Data. 5. Repeat steps 1-4 for other trials.

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 * __Data:__**
 * **Pace** || **Force (N)** || **Time (Sec.)** || **Distance Traveled (M)** || **Velocity (m/s)** ||
 * **Walk** || 232.2 || 5.60 || 5 || .89 ||
 * **Speed Walk** || 315 || 3.85 || 5 || 1.30 ||
 * **Light Jog** || 356 || 3.04 || 5 || 1.64 ||
 * **Fast Jog** || 636 || 2.18 || 5 || 2.29 ||
 * **Run** || 719 || 1.80 || 5 || 2.77 ||
 * **Lineman Stance** || 419 || 1.46 || .61 || .42 ||

When Paul travels at a higher velocity, he will exert more force on the blocking shield. This is proven by our data table above. Paul ran the same distance every time (exept for the last trial), and we measured his velocity using the equation V=D/T. It is clear that when Paul ran faster, he exerted more force on the blocking shield. For example, when Paul ran 2.29 m/s, he exerted 636N of force. However, when he ran 2.77 m/s, he exerted a force of 719N. That is a difference of 83N when he only increased his speed by .48 m/s! Also, when Paul traveled a mere .89 m/s, he exerted 232.2N of force on the blocking shield. However, when he traveled 1.30 m/s, only going .41 m/s faster, he increased his force by 82.8N! This data proves that increasing velocity increases the amount of force exerted. This data makes sense because in the equation V=D/T, time and velocity are inversely proportional, which mean as the time goes down, the velocity goes up. So it makes sense that the data shows that as it took less time, he was going faster.
 * __Conclusion:__**

1) Paul might not have been traveling at a constant velocity, so the numbers might not have been perfectly accurate. Next time, we will try to get him moving at a constant speed. 2) After zeroing out the force plate, I was still holding the blocking shield, so the force that was read might have been a few Newtons off. Next time, I will put down the shield before zeroing out the plate. 3) When Paul connected with the shield, he thrusted his shoulder slightly, so that would have affected the data. Next time, Paul wil try not to swing his arms.
 * __Errors:__**