1. Friction
affects forward motion by repelling or trying to cancel the force which the
opposite of its direction. For example, the wheel against the road pavement.
3. Air resistance affect the velocity of a falling object by either interfering
with the gravitation force the object is acting on the subject. Hence, these
since air assuming that the direction is perpendicular with gravity will result
the object to drop sideways or gradually.
4. The friction of the pavement and the air molecules.
5. Since the exerted force of the human is greater the object moves until the
frictional force cancel itself or produce a net force both the force of the
chair, gravity and friction.
6. Third law of motion which states that the force exerted of A to B, B will
exert the same force that was exerted by A leaving the gravitational force
canceled.