Work, Energy, and Power (AQA A-Level Further Maths): Flashcards

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Work, Energy, and Power
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Definition of work

Energy transfer when force moves object

Formula: work by constant force

W=F×xW = F \times x

Unit of work

Joule (J), where 1 J=1 N m1 \text{ J} = 1 \text{ N m}

Formula: work by variable force

W=FdxW = \int F \, dx

Formula: work at angle θ\theta

W=Fcosθ×xW = F \cos \theta \times x

Do perpendicular forces do work?

No, only parallel component does work

Definition of power

Rate of doing work

Formula: power (constant FF and vv)

P=F×vP = F \times v

Formula: kinetic energy

KE=12mv2\text{KE} = \frac{1}{2}mv^2

Formula: gravitational potential energy

GPE=mgh\text{GPE} = mgh

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