1 youre investigating a fender bender at a red light

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1. You’re investigating a fender -bender at a red light involving a compact car in the front and a larger pickup truck in the rear. The driver of the compact says, “The truck didn’t see the red light and rear- ended me.” The driver of the truck says, “That light turned green and the compact hit the gas… in reverse… and backed into me.” The skid marks left after the collision indicate the compact moved forward and the truck moved backward. Because the bumpers are at the same level and absorbed most of the impact, assume the collision was mostly elastic . Who is at fault? Prove it. 2. Hollywood and video games often depict the bad guys b eing “blown away” when they’re shot by a bullet (i.e. once hit, their feet leave the ground and they fly backwards). Assuming that even if a handgun cartridge did generate enough momentum for the bullet to do this, why is it still nonsense on-screen?
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6-9 Name: Date: Instructor’s Initials Partner: PHYS 2108 Section: Conservation of Linear Momentum Data Table 1: Recorded Speeds Elastic Collisions V 1(projectile) Before V 1(projectile) After V 2(target) After M 1(projectile) = M 2(target) M 1(projectile) < M 2(target) M 1(projectile) > M 2(target) Inelastic Collision V 1(projectile) Before V 1(projectile) After V 2(target) After M 1(projectile) = M 2(target) Explosion V 1(rearward half) After V 2(forward half) After Each Piece ≈ Equal Wrap-Up V 1(projectile) in Gate 1 V 1(projectile) in Gate 2 M 1(projectile) By Itself Data Table 2: Recorded Masses Projectile Cart (M 1 ) Magnetic Target Cart (M 2 ) Added Steel Weight Data Table 3: Momenta & Kinetic Energies of Each Cart Momentum of Each Cart (kg m/s) Kinetic Energy of Each Cart (J) Elastic Collisons P 1(project.) Before P 1(project.) After P 2(target) After KE 1(proj.) Before KE 1(proj.) After KE 2(target) After M 1(projectile) = M 2(target) M 1(projectile) < M 2(target) M 1(projectile) > M 2(target) Inelastic Collision P 1(project.) Before P 1(project.) After P 2(target) After KE 1(proj.) Before KE 1(proj.) After KE 2(target) After M 1(projectile) = M 2(target) Explosion P 1(rearward half) After P 2(forward half) After KE 1(rearward half) After KE 2(forward half) After Each Piece ≈ Equal Wrap-Up P 1(projectile) in Gate 1 P 1(projectile) in Gate 2 KE 1(projectile) in Gate 1 KE 1(projectile) in Gate 2 M 1(projectile) By Itself
6-10 Data Table 4: Total Momenta & Kinetic Energies Total Momenta (kg m/s) Total Kinetic Energies (J) Collisions Before Collision After Collision Before Collision After Collision Elastic Equal M 1(projectile) = M 2(target) Elastic Heavy Target M 1(projectile) < M 2(target) Elastic Heavy Projectile M 1(projectile) > M 2(target) Inelastic M 1(projectile) = M 2(target) Before Explosion After Explosion Before Explosion After Explosion Explosion Wrap-Up Gate 1 Gate 2 Gate 1 Gate 2 M 1(projectile) By Itself Data Table 5: Percent-Change in Momentum & Kinetic Energy Collisions Momentum Kinetic Energy Elastic Equal M 1(projectile) = M 2(target) Elastic Heavy Target M 1(projectile) < M 2(target) Elastic Heavy Projectile M 1(projectile) > M 2(target) Inelastic M 1(projectile) = M 2(target) Wrap-Up M 1(projectile) By Itself

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