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Power Out Thursday 12-8-2010

In physics, power is the rate at which work is performed or energy is converted

If ΔW is the amount of work performed during a period of time of duration Δt, the average power Pavg over that period is given by the formula

 P_\mathrm{avg} = \frac{\Delta W}{\Delta t}\,.

It is the average amount of work done or energy converted per unit of time. The average power is often simply called “power” when the context makes it clear.

The instantaneous power is then the limiting value of the average power as the time interval Δt approaches zero.

 P = \lim _{\Delta t\rightarrow 0} P_\mathrm{avg} = \lim _{\Delta t\rightarrow 0} \frac{\Delta W}{\Delta t} =  \frac{dW}{dt}\,.

In the case of constant power P, the amount of work performed during a period of duration T is given by:

 W = PT\,.

In the context of energy conversion it is more customary to use the symbol E rather than W.

In mechanics, the work done on an object is related to the forces acting on it by

 W = F \cdot \Delta d \,


F is force
Δd is the displacement of the object.

This is often summarized by saying that work is equal to the force acting on an object times its displacement (how far the object moves while the force acts on it). Note that only motion that is along the same axis as the force “counts”, however; a force in the same direction as motion produces positive work, and a force in an opposing direction of motion provides negative work, while motion perpendicular to the force yields zero work.

Differentiating by time gives that the instantaneous power is equal to the force times the object’s velocity v(t):

 P(t) = \mathbf{F}(t) \cdot \mathbf{v}(t) \,.

The average power is then

 P_\mathrm{avg} = \frac{1}{\Delta t}\int\mathbf{F} \cdot \mathbf{v}\;\mathrm{d}t \, . Source Wikipedia
I was never good at Physics. LETS TRAIN…

Dynamic Mobility Warm-up
20 minutes Skipping
5×2 BB Cleans
6×1 BB Heavy Jerks (80%-90% Max)
Rest 3 minutes between each set
6×10 BB Light Push Press (30%-50% Max)
Rest at the top position
Cool Down

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Valentine Rawat
Personal Trainer · S&C Coach · Official Trainer to Sky1 Obese A Year to Save My Life & SkyLiving FAT: The Fight of My Life I'm a father and a husband, and my girls are my inspiration to be better, do better & continually help others achieve better of themselves.

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