local motion
...by the bow. Buriden disagreed with this in stating that an “impetus” or force impressed onto the arrow so that it keeps moving after it leaves the bow is the cause of projectile motion. This theory on projectile motion seems more compatible with evidence experienced in the physical world for it allows for the force behind a projectiles motion to remain in the projectile which was physically acted upon by the projector. Aristotle’s theory does not explain the projectiles motion after leaving the projector in a way that past experience has shown the physical world to work. It allows a physical body to instill a force in a medium that is not attached to the projectile and move it. How can the power in the medium move it without being attached to it in some way to place a force upon it? Motion is the movement of a body from one place to another. In Aristotelian philosophy motion exist as “natural” or “forced”. Natural motion is an objects inherent tendency to move towards its place of origin, like a rock towards earth or fire towards the outermost celestial ring of fire. Forced motion is any motion caused by an outside force acting on a body that alters its natural motion. Recent research into local motion has showed that motion can exist in different intensities. Like that of warmth, there is more than one degree, for warmth can very from hot to cold. Motion has the same property in that it can be described as fast or slow. Velocity, a word describing the degree of motion, gives modern Aristotelians the ability to figure the degree at which motion can exist. This development is based on Aristotle’s logic that the faster something is moving the less time it will take for it to cross a certain distance. On the term velocity, which was just introduced, Aristotle’s teachings made the swiftness or velocity of an object in motion a function of the resistance against it. If this were the case then in a vacuum, where there is no resistance, a falling body would have an infinite velocity. This is due to the fact that there is no medium to resist its motion. On these grounds Aristotle dismissed the possibility of a vacuum. The modern interpretation of the affect of a vacuum on the velocity of a moving body comes from Mertonian Bradwardine. Bradwardine mathematically deduced that velocity is not proportional to force divided by resistance like Aristotle believed but that velocity increases arithmetically as force divided by resistance increases geometrically. This means that to double velocity you must square the ratio F/R. This makes infinite velocity impossible and allows for the possibly of a vacuum to exist. Aristotle’s “forced motion” is the motion of a body caused by an outside force acting upon it. This lays a ground work for some forms of motion like pushing or pulling where one body is constantly putting a force on another to move it but does not explain projectile motion. New insight came to this problem from John Buriden in the early fourteenth century. Aristotle believed that a projectile, like an arrow, propelled by a projector, a bow, is moved, after leaving the bow, by power put into its surrounding medium by the bow. Buriden disagreed with this in stating that an “impetus” or force impressed onto the arrow so that it keeps moving after it leaves the bow is the cause of projectile motion. This theory on projectile motion seems more compatible with evidence experienced in the physical world for it allows for the force behind a projectiles motion to remain in the projectile which was physically acted upon by the projector. Aristotle’s theory does not explain the projectiles motion after leaving the projector in a way that past experience has shown the physical world to work. It allows a physical body to instill a force in a medium that is not attached to the projectile and move it. How can the power in the medium move it without being attached to it in some way to place a force upon it? Motion is the movement of a body from one place to another. In Aristotelian philosophy motion exist as “natural” or “forced”. Natural motion is an objects inherent tendency to move towards its place of origin, like a rock towards earth or fire towards the outermost celestial ring of fire. Forced motion is any motion caused by an outside force acting on a body that alters its natural motion. Recent research into local motion has showed that motion can exist in different intensities. Like that of warmth, there is more than one degree, for warmth can very from hot to cold. Motion has the same property in that it can be described as fast or slow. Velocity, a word describing the degree of motion, gives modern Aristotelians the ability to figure the degree at which motion can exist. ...