what is force?

compare the balanced and unbalanced force.

Balanced:- balanced force will not cause a change in the motion of a moving object. when sum of forces in an object is zero , the force is set to be balanced. Unbalanced:- unbalanced forces produce a change in motion, such as a change in speed or a change in direction. when sum of forces is not zero, it is said to be unbalanced

Describe force and explain how force act on an object?

Force is a push or pull exerted on an object in order to change the motion of the object, force has size and direction. SI unit is newton(n) when a "force act on an object" it is discussing how a force is influencing an object.

how do you determine the net force on an object if all forces act in the same direction?

If all of the forces acts on the same direction you must add the forces to determine the net force.

how do you determine the net force on an object if all forces act in the different direction?

If all the forces acts in the different direction the subtract the greater number by the smaller number to determine the net force.