Perform one collision for each of the four cases

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Chapter 8 / Exercise 8.18
College Physics
Serway/Vuille
Expert Verified
Perform one collision for each of the four cases below. For each, record velocities and calculate the momenta and kinetic energies. Remember, you must record velocities! Note the direction that each glider passes through the photogates before and aftereach collision, as this determines the sign of the velocity. Case 1:One glider initially at rest, the other glider moving; neither glider has added mass. Case 2:One glider initially at rest with 100 grams added mass, the other glider moving with no added mass. Case 3:Both gliders in motion, one with 100 grams added mass, the other with no added mass. Case 4:Both gliders in motion, neither with added mass. Increase the initial velocity of one glider by increasing the tension in the rubber band of one launcher. C. Questions[2.0] Is momentum conserved? How accurately can you verify it with these measurements? How well is kinetic energy conserved in the collisions? If energy is not perfectly conserved, where does the imbalance go (or come from)? What sources of systematic error do you recognize? How might timing uncertainty effect your measurements? (Refer to previous labs where you may have estimated the timing accuracy of the photogates.) 5
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Chapter 8 / Exercise 8.18
College Physics
Serway/Vuille
Expert Verified
Procedure – Perfectly Inelastic Collisions1. Weigh the glider attachments and modify the gliders as stated below Weigh the “needle” and wax plug separately. Enter the masses into your notebook. Remove the rubber band bumper from the glider and replace it with the needle placed in a lowerhole on one end. On the other glider, remove the metal tab and replace it with the wax filled plug, in the lower hole on one end. Place both gliders on the air track with needle pointing at the wax filled plug. 2. Prepare a table in your notebook to record measurements. Something like ... m1(kg) m2v1i(m/s) v2ivfPiPfΔPKiKfΔK3. Make measurements[1.5]Perform one collision for each of the four cases below. For each collision record the velocities. After the gliders collide and stick together, they will travel as a pair through photogate #1 or #2. The computer will display two values for “Velocity”, because the photogate is blocked twiceduring the passage of the glider pair. Record the average of these speeds for the value of vf. Don’t forget to record the correct sign for the velocity. After measuring the velocities, calculate the momenta and kinetic energies: Case 1:One glider initially at rest, the other glider moving; neither glider has added mass. Case 2:One glider initially at rest with 100 grams added mass, the other glider moving with no added mass. Case 3:Both gliders in motion, one with 100 grams added mass, the other with no added mass. Case 4:Both gliders in motion, neither with added mass. Increase the initial velocity of one glider by increasing the tension in the rubber band of one launcher. 4. Questions [2.0] Is momentum conserved? How accurately can you verify it with these measurements?How much kinetic energy is lost in the inelastic collisions?