What is a force? What changes can be produced by a force?

Hint: Force is any influence that changes the state of an object. It is described as the effort done by means of pulling or pushing.
Types of forces
1. Balanced forces
2. Unbalanced forces

Balanced forces: When the forces acting on the body are applied in such a way that they cancel out each other’s effect and produce a net zero effect are called balanced forces.

Unbalanced forces: When the forces acting on the body are applied in such a way that they do not cancel out each other’s effect and cannot produce a net zero effect are called unbalanced forces.

Complete step by step solution:

Consider the above situation.
If u, v and w are such that then they would cancel out each other’s effect and the net effect would be a 0-force acting on the block. However, if u, v and w are such that then they do not cancel out each other’s effect and some force will be applied on the block.
Force is defined as the effort done by means of pulling or pushing. Its SI unit is Newton (N). Force is a vector quantity.
Balanced forces often do not create any effect but unbalanced forces can bring a change in the object. These are mentioned below
Force can the shape of the object
Force can change the size of the object
Force can change the speed of the object
Force can stop a moving object

Note:
Whenever we say that a force has produced some change, it means that some unbalanced force is present there which is causing the change. It is well understood that a balanced force won’t produce a change since it is already counteracted. The changes produced by the forces are subject to the object on which force is applied.