Comparison Essay On Wood Bats

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The choice of materials used to construct baseball bats has evolved over the years,

starting with solid wood, then to aluminum and now to composites. Major League Baseball only

plays with wood bats, but just about every other league from youth softball to college baseball

uses a combination of aluminum and composite bats. So is one better than the other? The

game of baseball is changing. From safer helmets to elbow guards (which I personally

recommend), each part of the game continues to change with the growth of technology.

However, the use of wood bats has remained constant over the years. Even though wood bats

may be more expensive, the risks of using a metal bat could outweigh the cost. Even with an

increase on metal bat standards, …show more content…

In contrast the aluminum bat is actually heavier, but since

its balance point is more than an inch closer to the handle it will be easier to swing. This is

directly related to the swing weight of a bat - the reason that not all 28oz softball bats swing the

same. An end-loaded bat can have the same weight as a normal bat, but will feel heavier

because more of the mass is distributed towards the barrel end of the bat.” (acs.psu.edu)

MOI (moment-of- inertia) is the product of mass and the square of a distance - which

while not the same as the CM location is strongly influenced by the balance point. The closer

the CM is to the handle, the lower the MOI will be. Several studies have shown that swing

speed depends strongly on the moment-of- inertia of the bat; a player can swing a lower inertia

bat faster. This affects performance because higher bat speed is directly related to higher batted

ball speed. The faster a player can swing a bat, the higher the final speed of the ball. …show more content…

Getting back to the comparison of wood and aluminum bats, an aluminum bat with the

same weight as a wood bat will have a significantly lower inertia and that means it could be

swung faster than the wood bat. When a ball hits a wood bat, it compresses to nearly half its

original diameter, losing up to 75% of its initial energy to internal friction forces during this

compression. In a hollow bat, however, the bat barrel compresses somewhat like a spring, when

the ball impacts it. This means that the ball is not compressed as much and therefore loses less

energy to internal friction forces. Furthermore, most of the energy temporarily stored in the

barrel is returned to the ball, and the energy which is lost in the bat compression is a small

fraction of what would have been lost in the ball if it had impacted a wood bat instead. The

physics behind the trampoline effect is somewhat complex.

What I want to discuss is that a trampoline effect really does seem to be partly

responsible for improvement in performance of aluminum bats over wood. The metal bat can

potentially hit a ball 5-7mph faster than the wood bat. This can be explained if the metal bat

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