collisions + explosions

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8 Terms

1
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how do you calculate an inelastic/elastic collision?

  1. calculate sum of kinetic energy before the collision

  2. calculate the sum of kinetic energy after the collision

if the two values are equal = elastic
if the two values are different = inelastic

2
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what is an elastic collision?

  • objects won’t stick together

  • move off with different velocities after an event

3
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what is conserved after an elastic collision?

  • momentum

  • total energy

  • kinetic energy

4
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what is an inelastic collision?

  • objects stick together

  • move off with the same velocity after an event

5
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what is conserved after an inelastic collision?

  • momentum

  • total energy

KINETIC ENERGY IS NOT CONSERVED, BUT TRANSFERRED AS HEAT/SOUND

6
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compare inelastic and elastic collisions:

  • elastic collision = kinetic energy, momentum, total energy conserved

  • inelastic collision = kinetic energy not conserved; total energy and momentum is conserved

7
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what are explosions?

momentum before the collision is 0

8
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what are examples of explosions?

  • skateboard

  • gun

  • bomb

  • ice skaters moving off together

  • fireworks