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law of conservation of momentum investigation
how momentum is conserved in collision
law of conservation of momentum investigation
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Recommended: law of conservation of momentum investigation
Conservation of Momentum
Purpose: To show that momentum is conserved in a closed system by illustrating the conservation of momentum in an elastic collision and an inelastic collision.
Method: If momentum is conserved in a closed system, the total momentum of the system before collision should equal the total momentum of the system after the collision. Strobe photos will be used in the calculations that will prove that momentum is conserved.
1.) Elastic collision: A strobe photo will be used that shows a large glider smashing into a smaller glider which is initially at rest. This will cause the smaller glider to move and the large glider will continue to move also.
2.) Inelastic collision: A strobe photo will be used that shows a glider smashing into another glider which is initially at rest. When they collide the two gliders will stick together and will move.
-The masses, distances and times will be measured in order to calculate the momentums of the systems before and after collision occurs.
Data:
V = d/t P = m x v
1.) Elastic collision:
When Mass Distance Time Velocity Momentum
Glider A Before Collision .31215 kg .009m .6s .015 m/s .00468 Kg m/s
Glider B Before Collision .15580 kg — — 0 m/s 0 Kg m/s
Glider A After Collision .31215 kg .005m 1.0s .005 m/s .00156 Kg m/s
Glider B After Collision .15580 kg .011m .6s .018 m/s .00280 Kg m/s
2.) Inelastic collision:
When Mass Distance Time Velocity Momentum
Glider C Before Collision .3105 kg .016m 1.0s .016 m/s .004968 Kg m/s
Collision and its Implications." Defense Technologies Information Center. 25 Jan 1994. http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA274926 (accessed Mar 23, 2012).
In this experiment we positioned a marble ball on a wooden roller coaster positioned on a physics stand in the sixth hole. Throughout the experiment, we used an electronic timer to record the time of the marble where it passed through the light beam of its clamp. We positioned the clamp at a certain point on the roller coaster and measured the distance from the marble to the clamp; the height of the clamp; and finally the time the ball traveled through the clamp. After we recorded these different figures we calculated the speed of the marble from the given distance traveled and the time. We repeated the step 14 times, then proceeded to graph the speed and the height. Next, we took the measurements of position of the clamp, height, and speed and calculated the potential energy, the kinetic energy, and the total energy. Total energy calculated as mentioned before. Potential energy is taking the mass (m) which is 28.1g times gravity (g) which is 9.8 m/s2 times the height. Kinetic energy is one-half times the mass (m) times velocity (v2). Finally we graphed the calculated kinetic, potential, and total energies of this experiment.
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2. A He and H atom collide elastically in a head-on collision. (a). If they have the same kinetic energy (KE) to begin with, which one gains KE? Answer this by calculating the amount gained and lost for both, relative to their initial value. (b). Suppose the atoms had the same mass but different kinetic energies? Do not do a detailed calculation here, but instead make a physical argument as to why the “slower” thus “cooler” atoms would slow down the faster, hotter atoms. This is one process for the moderation of hot neutrons in a nuclear fission reactor by the water used as its coolant.
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Henderson, T. n.d. The physics classroom tutorial. Lesson 2: Force and Its Representation [Online]. Illinois. Available at: http://gbhsweb.glenbrook225.org/gbs/science/phys/class/newtlaws/u2l2b.html [Accessed: 28th March 2014].
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