Potential Energy

The work done by a force on a body during a time interval t2 — t1 is equal to the integral of the power exerted by the force on the body over the same time interval:

in which W1-2 denotes the work done by the force on the body during the time interval t2 - t1. In this equation, the vector v represents the velocity of the point of application of force F. The position vector connecting the origin O of the inertial reference frame E to the point of application of the force F is termed r and is represented in terms of its projections to the axes of the coordinate system as follows:

In the following, we present expressions for the work done by various types of forces that are commonly associated with human movement and motion.

Getting Started With Dumbbells

Getting Started With Dumbbells

The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.

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