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Catapult Lab Help: Calculating Projectile Motion and Energy | Physics Lab Tips
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[QUOTE="alli66, post: 5903401, member: 637490"] [COLOR=#ff0000][Note from mentor: This was originally posted in a non-homework forum, therefore it does not use the homework template.][/COLOR] we did a lab on catapult but I'm having trouble figuring out the math? i calculated the hangtime, but all i did was take the original time and divide it by 2, is that right? QUESTIONS: [B]1) how long did it take to reach peak height? 2) what is the projectiles initial vel in the x and y direction? 3) what was the initial vel.? 4) what was the peak height? 5) how much PE did the ball have at the peak height?use h from #4 6) what's the KE of the ball at the launch? use vi from #3 7) how fast is the ball moving at the peak height?use conservation of energy 8 )what was the elastic P.E of the catapult? 9) what was the spring constant? 10) how much work was done by gravity on the ball?[/B] [I]DATA: - catapult launch angle 70 degrees - length of armature = 28cm - elastic band length before= .875in - elastic band length after= 2.75 in - mass of ball= 18.75 g launch distance: trial 1: 12.85m, trial 2: 3.09m, trial 3: 3.15m, avg of the 3= 3.03 m hang time: original time divided by 2 to get hang time? that's what i did but i think its wrong: trial 1: 1.60s/2 =.8 sec, trial 2: 1.65 sec/2= .825, trial 3: 1.71/2=.855s,, avg of 3 hangtimes= .8266secs[/I] [/QUOTE]
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Catapult Lab Help: Calculating Projectile Motion and Energy | Physics Lab Tips
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