15 lines
723 B
Plaintext
15 lines
723 B
Plaintext
== UNIT 4: LINEAR MOMENTUM AND COLLISIONS ==
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Momentum: p = m*v (vector quantity)
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Impulse: J = F_avg*Δt = Δp (change in momentum)
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Impulse-momentum theorem: impulse = momentum change
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Force-time graph area = impulse
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Center of mass: x_cm = Σ(m_i*x_i) / Σm_i
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v_cm = Σ(m_i*v_i) / Σm_i
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Conservation of momentum: Σp_initial = Σp_final (isolated system)
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External force = rate of change of momentum
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Elastic collision: KE conserved AND momentum conserved
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Inelastic collision: momentum conserved, KE NOT conserved
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Perfectly inelastic: objects stick together, max KE loss
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1D vs 2D: use components for 2D collisions
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Explosions: reverse of inelastic collision, momentum conserved
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Internal forces don't change center of mass motion |