A force is a push or pull upon an object resulting from the object's interaction with another object.
We have 3 laws of motion or Newton's laws
1. The law of inertia or first law postulates that a body will remain at rest or in straight motion with a constant speed unless an external force is applied.
2. Newton's second law or fundamental law, postulates that the net force that is applied on a body is proportional to the acceleration it acquires on its path.
The formula is F=ma
where F is the force, m is the mass and a is the acceleration
3. Newton's third law postulate says that every action generates an equal reaction but in the opposite direction.