(σ = F/A) Tensile stress is the outward normal force per area
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Strain Equations
(£= x/L) Is the relative change in shape or size of an object due to external applied-force.
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Efficiency
POWER OUT/POWER IN X 100
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Work done
(W=Fx) Work done and energy transferred are measured in joules (J).
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Work done (Verical movement)
(W=Mgh) Work is the result when a force acts on an object and moves it by some distance
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Power
(P=Fv) power is the rate of doing work, the amount of energy transferred per unit time. Having no direction, it is a scalar quantity.
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Speed
(S=D/T) is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction.
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Velocity.
(V=Δs/Δt) Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value.
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