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Lab 3 Key - Lab Time PHS 381L Biomechanics...

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Lab Time: ____________________________ PHS 381L - Biomechanics ENERGY/POWER/PROJECTILES Learning objectives: To increase understanding of energy, power and projectile motion. This lab will focus on principles energy relationships and power to increase the understanding of the relationships between energy, momentum, impulse and power. The second part of the lab will focus of optimum projectile angle. Equipment: force plate data from a previous lab (acceleration times, flight time) calculator Assumptions: we will consider the height of the center of mass while standing (and at take off) to be at 0.85 meters. Chapters : background info for this chapter can be found in chapters 2, 3 and 4. Equations you might need are found in chapters 2, 3 and 4 Procedures: (show work!) 1) Using the vertical jump data from last week’s lab session calculate the jumper’s potential and translational kinetic energies at the moment take off (the moment of take off is the instant the feet leave the ground)? (2pts) show all work! KE = ½ mv 2 KE = ½ (85 kg) (2.43 m/s) 2 KE = 250.96 J PE = mgh PE = (85kg)(9.81 m/s 2 )(0.85 meters) PE = 708.77 J 2) What were the translational kinetic and potential energies at the apex of your jump? (2pts) show all work. At the apex of a jump, velocity is 0. Thus, KE = ½ mv 2 = ½ (85 kg) (0) 2 = 0 J PE = mgh PE = (85kg) (9.81 m/s 2 ) (1.1509 m) -- (The .3009 m was the max displacement (or ∆y) from last week as calculated from the take off velocity of 2.43 m/s. To calculate the
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