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Kinematic/Free Fall

Kinematic/Free Fall . Tommy Myszka Nick Sraga Mike Jewell. Terms. Speed – distance traveled in a period of time Velocity- distance traveled in a period of time in a certain direction Instantaneous velocity – how fast you are traveling at a particular time

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Kinematic/Free Fall

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  1. Kinematic/Free Fall Tommy Myszka Nick Sraga Mike Jewell

  2. Terms • Speed – distance traveled in a period of time • Velocity- distance traveled in a period of time in a certain direction • Instantaneous velocity – how fast you are traveling at a particular time • Acceleration – change in velocity over time

  3. speed = distance time acceleration = VF-VI time velocity = displacement time Other important equations VF2-VI2 = 2ad ½ at2 + VIt = d Equations

  4. Concepts • Initial speed always must be zero • Gravity equals -9.8 m/s/s • Free fall acceleration equals –9.8 m/s/s • As you free fall, your distance per second increases, as does your velocity per second

  5. Skydiving As you skydive, you’re free falling toward the earth at –9.8 m/s/s Examples From the Real World #1

  6. Rain As the falls it is constantly getting itself a bigger and bigger velocity towards the earth Examples From the Real World #2

  7. #1 A ball dropped from rest picks up speed 10 m/s. After it falls for 4 seconds, how fast is it going? Sample Question Equation: a=VF-VIT Givens A=10m/sT= 4sec 10m/s=VF-0 4 40=VF Answer: 40 m/s

  8. #2 A ball is thrown straight down with an initial speed of 20 m/s. After 3 seconds how fast is it going? Sample Question Equation: a=VF-VIT -9.8=VF-20 3 Givens VI=20m/st=3 seca= -9.8m/s2 29.4=VF-20 49.4=VF Answer: 49.4m/s

  9. Sample Question #3 You shoot an arrow straight up at 50m/s. When will it hit the ground? Given VF=0VI=50m/sa= -9.8 Equation: a=VF-VIT -9.8=0-50 t -9.8t = -50 t= -50 -9.8 Answer: 5.1

  10. Sample Question #4 Wieldy Coyote runs off a 100 meter cliff while chasing the Roadrunner. He begins to freefall. What is his velocity when he hits the ground? Given D=100ma=-9.8VI=0 Equation: VF2-VI2=2ad VF2-0=2(9.8)100 VF2=1960 VF= 44.2 Answer: 44.2

  11. Quiz Questions #1 A bullet fired horizontally at 650m/s. How far will it go in 1.1 seconds?Answer: 715m #2 A base ball is hit straight up to a height of 40 meters. How fast was the ball moving when it let the bat?Answer: 28 m/s

  12. Quiz Questions #3 If a skydiver jumps out of an airplane, and his shoot failed and hits the ground at 50m/s. How high was he when he jump?Answer: 127.5 meters #4 If a person jumps off a 15 meter cliff into water. What is the persons velocity when he hits the water?Answer: 17.15m/s

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