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Do Now

Do Now. Complete the Exit Ticket from yesterday’s class on Collisions. . Today’s Agenda . Important Dates & Reminders. Homework Should Be In Bin! Next homework due Friday! Make-Up Work News Projects & Past Homework Grades are slowly dropping! Round 4 Unit Exam Next Wednesday

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Do Now

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  1. Do Now Complete the Exit Ticket from yesterday’s class on Collisions.

  2. Today’s Agenda

  3. Important Dates & Reminders • Homework Should Be In Bin! • Next homework due Friday! • Make-Up Work • News Projects & Past Homework • Grades are slowly dropping! • Round 4 Unit Exam Next Wednesday • Study guide given yesterday! • Science Madness Projects due next Wed Dec. 13! • Do not wait until Tuesday night to complete this!!! • Science Expo is on Thu Dec. 14 • Community Service Saturday!

  4. Types of Collisions Elastic Collisions Inelastic Collisions • “Bouncy”/“Separate” • Momentum is conserved • Kinetic energy is alsoconserved • Equation: • m1v1i + m2v2i = m1v1f + m2v2f • “Sticky”/“Stuck Together” • Momentum is conserved • Kinetic energy is NOT conserved • Equation: • m1v1i + m2v2i = (m1+m2) vf

  5. Elastic Collisions m1v1i + m2v2i = m1v1f + m2v2f We’re just adding the individual and final momentums together!

  6. Elastic Collision Example • A 2 kg ball rolls at 3 m/s to the right and a 4 kg ball rolls at 2 m/s to the left. They collide. After the collision, the 4 kg ball rolls at 1 m/s to the right. What is the final velocity of the 2 kg ball?

  7. Inelastic Collisions m1v1i + m2v2i = (m1+ m2) vf Big difference with inelastic is since they’re stuck together after the collision, both masses have the same final velocity!

  8. Inelastic Collision Example • A 45 kg girl and a 70 kg boy are skating. The girl is traveling to the left at 4.5 m/s and the boy is traveling to the right at 6 m/s. They collide and get stuck together. What is their final velocity?

  9. Mixed Guided Practice First, let’s go over the Do Now slip.

  10. Mixed Guided Practice • A 7-kg medicine ball is rolled at 3 m/s towards a 10-kg medicine ball that is rolling at 2 m/s in the opposite direction. After they collide, the 10-kg medicine ball is rolling at 3 m/s in the positive direction. • What kind of collision is this: elastic or inelastic? • How fast was the 7-kg medicine ball after the collision?

  11. Tag Team • A 0.112-kg billiard ball moving at 1.54 m/s strikes a second billiard ball of the same mass moving in the opposite (negative) direction at 0.46 m/s. The second billiard ball rebounds and travels at .72 m/s after the head-on collision in the positive direction. Determine the post-collision velocity of the first billiard ball. • Person 1: Is this elastic or inelastic collision? • Person 2: Setup the problem. • Person 3: Solve for VF

  12. Tag Team • The diagram shows a 2-kg box colliding and sticking to a second box that is initially at rest. What is the mass of the second box? • Person 1: Is this elastic or inelastic collision? • Person 2: Setup the problem. • Person 3: Solve for mass of the second box.

  13. Individual Race War • A 9300-kg boxcar traveling at 15.0 m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 6.0 m/s. • What type of collision is this: elastic or inelastic? • What equation should we use to for this type of collision? • What is the mass of the second car?

  14. Tic-Tac-Toe Complete TWO rows or columns from the Tic-Tac-Toe board. When finished, get your problems checked and then work on homework.

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