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Physics Section 6.3 Apply the physics of collisions

Physics Section 6.3 Apply the physics of collisions. Inelastic collision – two objects stick together after colliding. The two objects become one object. In a perfectly inelastic collision, the momentum is conserved and kinetic energy is lost.

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Physics Section 6.3 Apply the physics of collisions

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  1. Physics Section 6.3Apply the physics of collisions Inelastic collision– two objects stick together after colliding. The two objects become one object. In a perfectly inelastic collision, the momentum is conserved and kinetic energy is lost. m1v1i+ m2v2i = (m1+ m2)vf m = mass (kg) v = velocity (m/s)

  2. problem A stationary boxcar with a mass of 25,000 kg is struck by another boxcar with a mass of 45,000 kg at a velocity of 2.5 m/s. If the cars become attached, what is their resulting velocity?

  3. problem A cart with a mass of 150 kg is traveling north with a velocity of 3.2 m/s. It collides in an inelastic collision with a cart with a mass of 120 kg, and a velocity of 2.4 m/s south. Find the resulting velocity after the collision.

  4. Kinetic Energy is NOT conserved in an inelastic collision. A clay ball with a mass of .35 kg hits another .25 kg clay ball and sticks together. The 1st ball had a velocity of 1.5 m/s east and the 2nd ball had a velocity of 2.2 m/s west. Find the change in kinetic energy before and after the collision.

  5. Elastic collision – two objects collide and rebound. In a perfectly elastic collision, total momentum is conserved, and total kinetic energy is conserved. The momentum of the objects is exchanged during the collision. http://www.teachertube.com/viewVideo.php?video_id=15865&title=Momentum_and_Collisions m1v1i+ m2v2i = m1v1f+ m2v2f (Momentum) ½ m1(v1i)2 + ½ m2(v2i)2 = ½ m1(v1f)2 + ½ m2(v2f)2 (energy) m = mass (kg) v = velocity (m/s)

  6. problem A marble with a mass of .015 kg is moving right with a velocity of .225 m/s. It collides with a .030 kg marble with a velocity of .180 m/s left in an elastic collision. After the collision, the smaller marble moves to the left with a velocity of .315 m/s. a. Find the velocity of the 2nd marble after the collision. b. Find the total kinetic energy before and after the collision.

  7. assignment • Page 220 • Problems 1-5

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