Final answer:
The magnitude of frictional force developed at the boundary between a stationary 10-kg block and a horizontal surface, when a net horizontal force of 10 N is applied, is 10 N.
Step-by-step explanation:
The question pertains to the topic of static friction in physics. When a net horizontal force of 10 N is applied to a 10-kg block on a horizontal surface and the block does not move, the magnitude of frictional force developed at the boundary between the block and the surface equals the applied force, which is 10 N. This is because the force of static friction is equal in magnitude and opposite in direction to the applied force up to its maximum value, which is enough to prevent the motion of the object. Since the block remains stationary, this indicates that the maximum static frictional force has not been exceeded.
In this scenario, according to Newton's first law of motion, if an object remains at rest despite an applied force, the net external force must be zero. This suggests that the applied force and the frictional force must be equal and opposite, so they cancel each other out. Thus, the frictional force is also 10 N.