Forces, Acceleration, and Energy (HSC SSCE Physics): Flashcards

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Power
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Definition of power

Rate at which work is done or energy is transferred

Power formula (work and time)

P=ΔWΔtP = \frac{\Delta W}{\Delta t}

SI unit of power

Watt (W)

1 watt equals (in J s⁻¹)

1 W=1 J s11\text{ W} = 1\text{ J s}^{-1}

Energy formula using power and time

ΔE=PΔt\Delta E = P\Delta t

Power formula using force and velocity

P=FvcosθP = Fv\cos\theta

Energy-time graph gradient represents

Power

Power-time graph area represents

Total energy transferred

Effect of longer time on power (same work done)

Lower power

Why fuel use increases at higher speeds

Air resistance increases, requiring more power to overcome it

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