To better understand what we would like to convey to readers, we will first of all take a step back, analyzing first the concept of strength and then of work.
through muscle engagement.According to the general principles of physics, the unit of measurement of force is expressed in Newton (N) - a parameter that also includes the gravitational force.
For example, if an object has a mass of 5 kilograms (kg) - this unit of measurement is not about weight, as most people believe - its strength will be roughly equal to 50 N.
To return to a concept closer to motor science, wanting to support a weight of 5 kg on the hand, opposing a resistance of 50 N, I will have to contract the muscles of the arm (especially the brachial biceps) with such a force that allows my forearm to remain immobile at the established angle. Here the principle of levers and the "moment of force" comes into play, which we will not analyze here.
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