Coal and petroleum products (fossil fuels) are a powerful resource of and energy. Following plants and animals are buried and "stored" underground for millions of years leading to the formation of these byproducts.

490 n  f=125n a=2.5m/s2

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion