Collisions and Explosions Pre-Lab Unit 9 - PowerPoint PPT Presentation

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Collisions and Explosions Pre-Lab Unit 9

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Collisions and Explosions Pre-Lab Unit 9 2 kinds of collisions - Inelastic and elastic Make a prediction about the conservation of momentum and kinetic energy in both ... – PowerPoint PPT presentation

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Title: Collisions and Explosions Pre-Lab Unit 9


1
Collisions and Explosions Pre-LabUnit 9
2
2 kinds of collisions - Inelastic and elastic
3
Make a prediction about the conservation of
momentum and kinetic energy in both elastic and
inelastic collisions.
4
What factors can you change and measure to test
your prediction?
  • ????

5
My suggestions
  • Mass of cart
  • Velocity of each cart
  • Sticking together or not

6
After lab, define elastic and inelastic to see if
your prediction and your data are correct!
7
Websitehttp//www.physics.uoguelph.ca/phyjlh/F
endt/phe/collision.htm
8
Collisions and Explosions Post-LabUnit 9
9
Examples of Momentum Charts

A 40 kg girl rollerblades at 4 m/s toward her 20
kg dog, who is running at 7 m/s in the opposite
direction. The dog leaps into the girls arms
and they continue rolling together. Determine
their velocity.

-7 m/s
10
2) A 0.03 kg bullet travelling at 300 m/s
ricochets off a wall at 100 m/s in the opposite
direction. Determine the momentum transferred to
the wall-earth system.
11
FDt mDv Dp
  • If there is a large impulse, the Dp will be
    great.
  • If there is a large force, there is a large
    acceleration, making Dv large
  • Large changes in p damage skin, bones, car
    bodies, etc
  • Padding, follow through, seat belts, airbags
    reduce the change in momentum
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