Learning Library

# Throwing a Baseball

### Materials:

• Baseball
• BB gun pellet
• Bowling Ball
• Marble
• Measuring Tape
• Flat and clear area
• Notebook
• Pen

### Procedure:

1. Hold the baseball, BB gun pellet, marble and bowling ball in your hands, observing each item’s weight. Order them from lightest to heaviest in your notebook.
2. Which do you think you will throw the farthest? Use this time to write down your guess, also called a hypothesis, in your notebook.
3. Find a lawn or field so that the objects you throw don’t break when they hit the ground.
4. Throw the BB gun pellet as hard as you can.
5. Measure and record the distance in your notebook.
6. Throw the marble as hard as you can.
7. Measure and record the distance in your notebook.
8. Throw the baseball as hard as you can.
9. Measure and record the distance in your notebook.
10. Throw the bowling ball as hard as you can, making sure not to hurt yourself.
11. Measure and record the distance in your notebook.

### Results:

The bowling ball travelled the shortest distance. The BB gun pellet travelled second shortest distance, followed closely by the marble. The baseball should have travelled the farthest.

### Why?

When you throw an object, physics is at work calculating just how far it goes. The distance an object is thrown relies on the force put into it. Force is the mass of an object multiplied by how fast that object accelerates. When throwing a very light object, you may be able to accelerate it very effectively, but because it weighs so little, the force applied to it will be tiny. This explains the short distance traveled by the marble and BB gun pellet. When thrown, a heavy object may have a lot of mass but will accelerate really poorly because your throwing arm is only so strong! Only a small force ends up being applied to it, which explains the extremely short throwing distance traveled by the bowling ball. So what’s the key to throwing things great distances? A balance between mass and acceleration, which is why the baseball travels the farthest.

What if you used different shapes of objects? Or used something to launch your objects besides your arm? This experiment can be altered in a variety of ways to demonstrate physics in action.

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