A crate of mass m is located in the center of a flatbed truck of mass M. The truck moves with constant velocity to the east and the crate moves with it, not sliding at all. Which of the following must be true? (There may be more than one answer.) The magnitude of the normal force of the road acting upon the truck is equal to Mg. The magnitude of the normal force acting on the crate is equal to mg. The force of kinetic friction on the truck due to the road points to the west. Since the truck moves with constant velocity, the driving force of the truck is balanced with the kinetic frictional force due to the road. The force of static friction on the crate due to the truck points to the east.

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: