In the figure, the lever arm, l, is distance r from the hinge to the point at which you exert your force. The torque is the product of the magnitude of the perpendicular force multiplied by the lever arm.
Children normally need a certain number of calories each day (energy allowance) that their bodies use as energy for normal daily activities (walking, breathing, etc.). This ranges for boys from 2000 calories for a 7-10 year old, 2500 calories for an 11-14 year old, and 3000 calories for a 15-18 year old. For girls the ranges are from 2000 calories for a 7-10 year old, to 2200 calories for an 11-18 year old. These are only estimates and some children need more (fast metabolism) or less (slow metabolism) of an energy allowance for daily activities.
For a moderately active child who averages 1,200 calories per day, between 60 and 240 of those calories should come from protein sources. More specifically, kids between 1 and 3 should consume 1.1 grams of protein for every kilogram of body weight each day.The recommended dietary allowance, the amount necessary to meet the needs of 97 to 98 percent of healthy kids in this age group, is 13 grams per day.or a moderately active child who averages 1,200 calories per day, between 60 and 240 of those calories should come from protein sources. More specifically, kids between 1 and 3 should consume 1.1 grams of protein for every kilogram of body weight each day.