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MSTC Physics 2

MSTC Physics 2. Chapter 6 Sections 3 and 4. 3 types of collisions. Elastic collisions Inelastic collisions Completely inelastic collisions Regardless of the type of collision, momentum is conserved. completely elastic collision. Collision in which no kinetic energy is lost

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MSTC Physics 2

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  1. MSTC Physics 2 Chapter 6 Sections 3 and 4

  2. 3 types of collisions • Elastic collisions • Inelastic collisions • Completely inelastic collisions Regardless of the type of collision, momentum is conserved.

  3. completely elastic collision • Collision in which no kinetic energy is lost (In the real world there is no such thing but we do get close.) Example – 2 billiard balls

  4. Inelastic collision • Collision in which some kinetic energy is lost Example – all real world collisions like a car crash

  5. Completely inelastic collision • Collision in which 2 objects stick together during the collision and a great deal of kinetic energy is lost Example – ballistic pendulum, 2 train cars that couple on the track

  6. Completely elastic collision V1f = (m1 – m2) v1 + (2m2) v2 (m1 + m2) (m1 + m2) V2f = __(2m1)_ v1 - (m1 – m2) v2 (m1 + m2) (m1 + m2)

  7. Sample Problem • 1. Consider the completely elastic collision between masses of 100 g and 200 g. The first mass is moving with a velocity of 30 cm/s to the right and the second mass has a velocity of 20 cm/s to the right. Find the final velocities of the two balls.

  8. Sample Problem 2. Consider the completely elastic collision between 2 balls of masses 100 g and 200 g, with velocities of 20 cm/s to the right and 30 cm/s to the left respectively. Find the final velocities of the two balls.

  9. Sample Problem 3. A ball of mass 0.25 kg and velocity 5 m/s collides head-on with a ball of mass 0.8 kg that is initially at rest. If the collision is elastic, what are the velocities of the balls after the collision?

  10. Sample Problem 4. A 50 g piece of clay moving at a velocity of 5 cm/s to the right has a head-on collision with a 100 g piece of clay moving at a velocity of 10 cm/s to the left. The two pieces of clay stick together during the impact. Find the final velocity of the clay, the initial kinetic energy, the final kinetic energy, and the amount of energy lost in the collisiion.

  11. Sample Problem 5. Two cars collide at an intersection. Car 1 has a mass of 1200 kg and is moving at a velocity of 95 km/h due east. Car 2 has a mass of 1400 kg and is moving at a velocity of 100 km/h due north. The cars stick together and move off at an angle. Find the final velocity of the combined cars.

  12. Sample Problem 6. Billiard ball 2 is at rest when it hits with a glancing collision by ball 1 moving at a velocity of 50 cm/s toward the right. After the collision ball 1 moves off at an angle of 35 degrees from the original direction while ball 2 moves at an angle of 40 degrees. The mass of each billiard ball is 0.017 kg. Find the final velocity of each ball after the collision.

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