What does net means? Like net force?

Net means total. The net force on an object is the sum of all the individual forces that act on the object. Add up all the individual forces and you get the net force (total force) acting on the object.

As far as I know, in a physics problem, net will always mean net force. Net force it the total of all the forces acring on something like an object.

We have F = MA = SUM(f) as the net force. It's what you have left over after adding up all the applied and reacting forces f.

EX: When we add up all the applied and reaction forces and get SUM(f) = 0 = F = MA a net zero force, the mass M is not accelerating; that is, A = 0.

EX: When we add them all up and get the net force SUM(f) = F = MA <> 0 that mass M is accelerating A <> 0.

Net means "what's left over." Same deal in finance. Revenues - Taxes - Expenses = net worth or net profit. It's the money you have left over.

Forces only exist in pairs. Force is the result of power per unit velocity.

Hence a net force is usually zero.Because one force is in one direction and the other in the opposite direction as per Newton's 3rd Law of motion.

"In physics, net force is the overall force acting on an object. In order to calculate the net force, the body is isolated and interactions with the environment or other constraints are represented as forces and torques in a free-body diagram."

Force is a vector. It has magnitude AND direction. Net Force is the vector sum of the forces. For example, with a block sliding down a ramp with friction, the net force is the component of weight in line with the ramp minus the friction force impeding motion down the ramp: Fnet = m*g*sinΘ - m*g*µ*cosΘ where Θ is the angle of the ramp with the horizontal and µ is the coefficient of friction between the block and the surface of the ramp. The friction force is in the opposite direction of the weight in line with the ramp so it subtracts from that force. Hope this helps.