Forces are due to an Interaction:-

• A force arises due to interaction between objects. When applying a force to an object, the interaction between the object and the source of force is required.
• For example- We can exert a force on a ball to move in any direction. It happens when we kick the ball, so the force that arises is due to the interaction between the feet of the player and the ball
• At least two objects must interact for a force to come into play. Thus, an interaction of one object with another object results in a force between the two objects. More than one force may act on an object.
• Whenever force is acting on a body, it causes the displacement in direction of the applied force.
• Two objects must interact for a force to come into play. Thus, an interaction of one object with another object results in a force between the two objects.
• Forces applied on an object in the same direction add to one another.
• If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces.
• Magnitude: The strength of a force is usually expressed by its    magnitude
• Force applied could be larger or smaller than the other or equal to each other.
• If the direction or the magnitude of the applied force changes, its effect also changes.
• The net force on an object is zero if the two forces acting on it in opposite directions are equal

Exploring Forces:-
A force can change the state of motion of an object, i.e. a force can make a stationary body move; it can stop a moving body; it can change the speed of the moving body.
If two bodies exert force in the same direction and to the same object then the net force acting on the object is the sum of both the forces exerted by the bodies.
If two bodies exert force on an object from opposite directions then the net force acting on the body will be the difference of the two forces and towards the direction of the larger force.