Final answer:
The net force is 14N, the acceleration is 3.5 m/s², the frictional force cannot be determined without the coefficient of kinetic friction, and the normal force is less than the weight of the mass.
Step-by-step explanation:
To determine the net force, we need to add up all the forces acting on the 4kg mass. The given forces are 5N, 4N, and 5N. Adding them up, the net force is 14N (5N + 4N + 5N = 14N).
To calculate the acceleration, we can use Newton's second law, which states that the net force is equal to the product of mass and acceleration (F = ma). Substituting the values, we have 14N = 4kg × a. Solving for acceleration, we get a = 14N / 4kg = 3.5 m/s².
To find the frictional force, we need to know the coefficient of kinetic friction between the mass and the inclined plane. Without that information, we cannot determine the exact value of the frictional force.
The normal force is the perpendicular force exerted by the inclined plane on the mass. It is equal in magnitude and opposite in direction to the weight of the mass. Since the mass is on an incline, the normal force will be less than the weight of the mass.