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.
Since the Dietary Guidelines for Americans 2010 recommend children within this age range consume 1,000 to 1,400 calories a day and fat provides 9 calories per gram, toddlers ages 2 to 3 should consume 33 to 62 grams of fat per day.he amount of fat children should consume each day is based on their age and caloric needs. The Institute of Medicine suggests toddlers ages 2 to 3 need 30 to 40 percent of their daily calories from fat.