Question

What statement best describes what happens when a pitcher throws a baseball with different amounts of force?

A.The mass of the baseball never changes so the more force in the pitchers arm, the higher the acceleration of the baseball before it leaves the pitcher's hand.

B.The mass of the baseball never changes and therefore neither does the acceleration of the baseball.

C.The mass of the baseball never changes so the more force in the pitchers arm, the lower the acceleration of the baseball before it leaves the pitcher's hand.

D.Baseballs do not accelerate as they go through the air.

Answer 1

Newton's second law allows us to find that the correct answer is:

   A) The mass of the baseball never changes so the more force in the pitchers arm, the higher the acceleration of the baseball before it leaves the pitcher's hand.

Newton's second law gives a relationship between force and the product of mass and acceleration of the body

          F = m a

Where F is the force, m the mass and the acceleration of the body.  The bold indicate vectors

The baseball ball is a solid body that has a fixed mass, therefore the pitcher uses different forces in the arm, the acceleration must change proportionally, as the force increases, the acceleration must increase (fastball).

Let's review the different claims

A) true. These statements are in accordance with Newton's second law

B) False. If the force changes any of the other two parameters must change

C) false. Force and acceleration are proportional

D) False. When the ball is in the air it is subjected to the acceleration of gravity

With Newton's second law we find that the correct answer is:

   A) The mass of the baseball never changes so the more force in the pitchers arm, the higher the acceleration of the baseball before it leaves the pitcher's hand.

Learn more about Newton's second law here

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