U9 - Linear Momentum & Collisions

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8 Terms

1

Momentum

p = mv

2

Isolated system (momentum)

  • No outside forces

  • dp/dt = 0

3

Nonisolated system (momentum)

  • dp/dt = ΣF

  • I = ∫ F dt = Δp

4

Perfect inelastic (1D)

  • vf = (p1 + p2)/mT

  • Δp = 0

5

Perfect elastic (1D)

  • pi = pf

  • Ki = Kf

<ul><li><p>p<sub>i</sub> = p<sub>f</sub></p></li><li><p>K<sub>i</sub> = K<sub>f</sub></p></li></ul><p></p>
6

Elastic (2D)

*Ki = Kf if perfect

<p>*K<sub>i</sub> = K<sub>f</sub> if perfect</p>
7

Rocket Δv eqn

Δv = ln(Mi/Mf)ve

8

Rocket force eqn

Fthrust = |ve(dM/dt)|