The line along which a force acts on an object is called the force’s line of action . The point where the force is acting on an object is called the point of application of the force. The force which opposes the relative motion between the surfaces of two objects in contact and acts along the surfaces is called the force of friction.
Galileo experimentally proved that objects that are in motion move with constant speed when there is no force acting on it. He could note that when a sphere rolls down an inclined plane, its speed increases because of the gravitational pull acting on it.
When all the forces acting on an object are balanced, the net force acting is zero. But, if all the forces acting on a body result in an unbalanced force, then the unbalanced force can accelerate the body, which means that a net force acting on a body can either change the magnitude of its velocity or change the direction of its velocity. For example, when many forces act on a body, and the body is found to be at rest, we can conclude that the net force acting on the body is zero.
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