Elastic and Inelastic Collisions
6.3
Perfectly Inelastic Collisions• When two objects collide and move
with each other after.
Practice Problems 6E, 1-5, p. 224:1. A2. A3. A4. A5. a.
b.
Kinetic energy is not constant in inelastic collisions• KE converted to sound and internal
energy as objects deform.• Decrease in KE can be calculated
using 0.5mv2
Practice Problems 6F, 1-5, p. 226:1. a.
b.2. a.
b.3. a.
b.
Elastic Collisions• After collision:
– Two objects• Remain separate.• Remain same shape after collision.
– Both momentum and KE remain the same
• Most collisions are neither elastic nor perfectly inelastic.– Most objects in an inelastic collision
do not stick.– In near elastic collisions, objects lose
energy to internal energy and sound.
• KE is conserved in an elastic collision.• If purely elastic both p and KE remain
constant before, during, and after the collision.
Practice Problems 6G, 1-4, p. 229:
1. a.b.
2. a.b.
3. a.b.
4. a.b.
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