89
Plan № 34
Project № 2
Science Project:
Falling Objects
Revisited
The purpose of this experiment is to test
various objects to determine whether they fall
at the same rate.
What does
Newton’s second law
of motion state?
How did
Galileo
discover that objects fall at the same rate?
Why did
Galileo
stipulate that objects fall at the same rate in a vacuum?
What role does air resistance play in the downward
acceleration
of an object?
What is
terminal velocity
?
400 years ago, the famous physics
Galileo
discovered that falling objects
accelerate at the same rate of speed. It does not matter whether you drop a penny
or a shot put out a third story window, the two objects will fall at the same rate
and reach the ground at the same time.
This constant acceleration was later discovered to be the force of gravity.
Though his theory was correct, not all objects will fall at the same rate because
gravity is not the only force acting on them. Air resistance and lift create forces
that push a falling object away from the center of the Earth’s gravity, slowing
the speed of descent.
• Various objects that can be dropped out of a second or third story
window.
Include a feather and a piece of paper in the objects.
• A friend to make observations at the bottom.
• A notebook
•
A pencil
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