## Reflection: Checks for Understanding Recreating Galileo's Leaning Tower of Pisa Investigation - Section 3: Explore

While the focus of this investigation is to learn how to use the Scientific Method to conduct and investigation involving gravity, many students began trying to explain why the tennis ball and styrofoam ball dropped at the same time: Gravitational Pull Misconception.

I'll want to address the misconception that the tennis ball and styrofoam ball experience the same pull of gravity very carefully as this can turn into a high school level conversation quickly! I always want to find an equal balance between challenging content and grade level appropriateness.

At this link, The Physics Classroom explains this concept clearly (below). I just hope I can find a way to make this more clear to my 5th graders!

• "We must recall Newton's second law - the law of acceleration. Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. When figuring the acceleration of object, there are two factors to consider - force and mass."
• "Applied to the elephant-feather scenario, we can say that the elephant experiences a much greater force (which tends to produce large accelerations. Yet, the mass of an object resists acceleration."
• "Thus, the greater mass of the elephant (which tends to produce small accelerations) offsets the influence of the greater force. It is the force/mass ratio which determines the acceleration."
• "Even though a baby elephant may experience 100 000 times the force of a feather, it has 100 000 times the mass."
• "The greater mass of the elephant requires the greater force just to maintain the same acceleration as the feather."
• "When the only force is gravity, the acceleration is the same value for all objects. On Earth, this acceleration value is 9.8 m/s/s. This is such an important value in physics that it is given a special name - the acceleration of gravity - and a special symbol - g."

Checks for Understanding: Misconception

# Recreating Galileo's Leaning Tower of Pisa Investigation

Unit 1: Gravity
Lesson 5 of 19

## Big Idea: In this lesson, students will use the Scientific Method to test the rates at which a tennis ball and a plastic ball fall to Earth.

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Standards:
Subject(s):
Science, Galileo, acceleration, gravity, mass
60 minutes

### Kara Nelson

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