Experimental projectile impact marks on bone: implications for identifying the origins of projectile technology
نویسندگان
چکیده
منابع مشابه
Projectile Motion
The steel ball will be launched horizontally by being released at a certain height on the ramp. It will then fall to the floor and make a mark on the landing paper. The horizontal distance from take-off to landing, x, is proportional to the initial horizontal velocity, v0, of the ball. The distance, x, can be measured with the meter stick. By using the SALT®, photogate and computer, the time ca...
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Introduction: A projectile is a body in free fall that is subject only to the forces of gravity (9.81ms⎯2) and air resistance. An object must be dropped from a height, thrown vertically upwards or thrown at an angle to be considered a projectile. The path followed by a projectile is known as a trajectory. If gravity were not present, a projectile would travel in a constant straight line. Howeve...
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We present evidence for the interactions between a ball and the container boundaries, as well as between two balls, that are mediated by the granular medium during impact cratering. The presence of the bottom boundary affects the final penetration depth only for low drop heights with shallow filling, in which case, surprisingly, the penetration becomes deeper. By contrast the presence of the si...
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years in applying the theoretical and methodological tenets of Darwinian evolutionary theory to the archaeological record (e.g., Barton and Clark 1997; Dunnell 1980; Lipo et al. 1997, 2005; Lyman and O’Brien 1998; Neiman 1995; O’Brien 1996; O’Brien and Lyman 2000, 2002, 2003a; Shennan 2002; Shennan and Wilkinson 2001). One of the key theoretical tenets of any theory of Darwinian evolution, be i...
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In this paper, I will describe various methods for defending against airborne projectiles. This includes tracking mechanisms for following objects in three dimensional space and predicting what paths they will take. In addition, methods of calculating interception trajectories and the factors involved will be discussed.
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ژورنال
عنوان ژورنال: Journal of Archaeological Science
سال: 2014
ISSN: 0305-4403
DOI: 10.1016/j.jas.2014.05.036