The magnitude of the moment of a force acting about a point or axis is directly proportinoal to the distance of the force from the point or axis. It is defined as the product of the force (F) and the moment arm (d).
The student athlete child between the ages of 9 and 13 should consume between 2,000 and 2,600 calories, and if they are between 14 and 18 they should consume between 2,800 and 3,200 calories. It is also important that the types of calories the athlete consumes are balanced between carbohydrates, proteins, and fats.
Teenage girls need more, too: 1,800 to 2,200 calories a day if they're ages 11 to 13, and 1,800 to 2,400 calories a day if they're age 14 to 18. Gender, body size, growth rate and activity level specifically determine how many calories teens need. Those involved in strenuous physical activity such as soccer, basketball, football or other sports may need 3,500 calories (more or less) daily. American Dietetic Association Complete Food and Nutrition Guide, 3rd ed.