Wood Vs Metal

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29-Aug-2014

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• What Has More Force Wood Or Metal Bat? By Nathaniel
• HYPOTHESIS
• A ball hit with a wood bat will travel farther than a ball hit with a metal bat.
• Newton's second law .
• Wood vs Metal
• Wood
• Greater Mass
• Weighs more
• Natural
• Solid
• Small sweet spot
• Metal
• Hollow
• Acceleration
• Does Not Break
• Large Sweet spot
• WOOD BAT WEIGHT AND MASS
• Is a wood bat stronger? Yes or No
• Mass- is a measure of total quantity of matter in
• an object (Mass of a bat is a constant)
• Weight- Weight is a measurement of the gravitational
• force acting on an object ( Weight of an object
• varies with the objects geographical location)
• Example: A 19oz bat at Woodward Academy weighs less at the equator and on the moon but the mass stays the same.
• Is a Wood bat Solid?
• YES
• Solid Is the physical state of a shape and a volume.
• The three states of matter are
• Solid: Wood is packed closely together
• Liquid: Units are not packed closely together
• Gas: Vapors are far apart.
• Wood Bats are made of Natural Material
• Wood is a pure substance that cannot be changed to other kinds of matter or physical means.
• Wood is a common substance used in everyday life.
• Home building
• Heating homes
• Making Furniture
• Making Tooth picks
• Making Baseball bats
• Making Pencils And Paper
• Wood Bat SWEET SPOT
• What is a sweet spot? A perfect small area on the barrel of the bat. The Preferred area of the bat to hit the ball.
• What happens when you hit the ball on the sweet spot?
• The ball travels farther because of Newton's 2 nd law of motion
• (F =M x A)
• What happens if you dont hit the ball on the sweet spot?
• Bat vibrates and takes away energy from the ball.
• If the ball is not hit on the sweet spot the ball does not travel as far.
• Metal Bats are Hollow
• Hollow means having a closed body which is not filled (bat barrels are empty)
• weight is distributed different than a wood bat.
• Center of mass for metal bat is closer to the handle.
• Center of mass for wood bat is closer to the barrel.
• Balance point: point on the bat where the weight can be balanced on both sides.
• Lever first class : fulcrum is in the middle and the load and effort is on either side
• Think of a see-saw
• Inertia of the bat makes all the difference
• Inertia is Newton's first law of motion: an object at rest stays at rest and an object in motion stays in motion.
• What does this mean?: center of mass is influenced by balance point which affects inertia.
• METAL BAT ACCELARTION
• Metal bats are 5-7mph faster than the wood bat
• Aluminum bats have the Trampoline effect
• When a wood bat hits a ball it compress and loses 75% of its energy.
• When an aluminum bat hits a ball it compresses but loses a fraction of its energy.
• What makes this possible?
• Energy -Comes from the batters body into the bat to the ball
• Inertia -Comes from the bat moving to the ball.
• METAL BATS DONT BRAKE
• Metal is strong
• The handle is a thin metal tube with thick walls
• The barrel is made of thin metal which may dent or crack but will not break.
• Wood bats are made with wood or ash and will break if the bat hits the ball towards the middle closer to center of mass.
• METAL BATS ARE MAN MADE
• How are metal bats made?
• Sprinting Toward First Base
• Ironing process metal heated up to 900 degrees to create the barrel and the handle.
• Passing Second Base
• Cleaning, Heat Treating, and Aging
• Heating treatment and aging up to 300 degrees
• Rounding Third Base
• Capping, and Silk Screening
• Polishing
• Safe at Home Plate
• - Final Assembly and Packaging)
• -Rubber grip and chemical coating.
• THE WOOD BAT IS STONGER AND HAS MORE MASS BUT THE HITTER CAN CONTROL THE METAL BAT BETTER..
• METAL BAT LARGE SWEET SPOT
• Is a metal bats sweet spot larger than a wood bats sweet spot?
• Yes because of the contact surface.
• Metal bat has a large contact surface
• Resulting in more hard hit balls
• More home-runs with a good swing not a perfect swing
• Wood bat has a small contact surface
• Resulting in ground out or fly out
• Home-runs must be a perfect swing.
• The wood bat center of mass is close to the end of the barrel.
• The center of mass of the metal bat is closer to the handle.
• EXPERIMENT TO FIND OUT WHICH BAT HAS MORE SPEED AND DISTANCE The next two slides you will see me hit with a wood and metal bat. Hitting with both bats involves Newton's 2 nd law
• Wood Bat Demonstration
• Wood Bat Data 60ft 57ft 15ft 58ft 55ft Average Distance Distance Distance Distance
• Wood Bat Data
• Metal Bat Demonstration
• Metal Bat Data 60ft 57ft 15ft 58ft 55ft Average Distance Distance Distance Distance
• Metal Bat Data
• Reference
• Kelly, J. (2000). Baseball; Celebrate Americas national pastime in pictures: The history, the heroes, the gear, and the game. Dorling Kindersley Publishing, Inc. New York, N.Y.
• Stoker, S.H. (2007). General Organic, and biological Chemistry(4 th ed). Houghtonn Mifflin, Boston, MA.
• www. Kettlering.edu