16 lines
846 B
Plaintext
16 lines
846 B
Plaintext
== UNIT 3: WORK, ENERGY, AND POWER ==
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Work done: W = F*d*cos(θ) where θ is angle between force and displacement
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Only force component parallel to displacement does work
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Negative work: force opposes motion (friction, air resistance)
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Work-energy theorem: net work = change in kinetic energy
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Kinetic energy: KE = 0.5*m*v^2
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Conservative force: work path independent (gravity, spring)
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Non-conservative force: work path dependent (friction)
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Gravitational PE: PE_g = m*g*Δh (only height change matters)
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Spring PE: PE_s = 0.5*k*x^2 where x is displacement from equilibrium
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Mechanical energy: E = KE + PE
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Conservation of energy: E_initial = E_final (if only conservative forces)
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Non-conservative work: W_nc = ΔKE + ΔPE
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Power: P = W/t (average) or P = F*v (instantaneous)
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Energy transfer via work
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Energy transfers between forms, never created/destroyed |