Final answer:
The normal reaction on a block of mass 10 kg on a horizontal surface is 98 Newtons, which is equal to the gravitational force (weight) of the block.
Step-by-step explanation:
The question you have asked involves understanding the normal reaction force on a block on a horizontal surface. The normal reaction is the force exerted by the surface to support the weight of the object. In this case, since the block has a mass of 10 kg and is on a rough horizontal floor, assuming there is no vertical acceleration, the normal force is equal to the gravitational force acting on the block, which is the weight of the block. On Earth, the gravitational force (weight) is calculated by multiplying the mass (m) of the object by the acceleration due to gravity (g), which is approximately 9.8 m/s2.
The normal reaction on a 10 kg block is therefore 10 kg × 9.8 m/s2 = 98 Newtons (N), directed perpendicular to the surface.