Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Suppose you dropped a feather and a hammer at the same time. Which object would
hit theground first? A hammer, because the feather would be affected by air resistance.
2. Imagine repeating the experiment in an airless tube, or tvacuum. Would this change the
result? If so, how? They’d hit the ground at the same time because no air equals
no airtresistance.
Gizmo Warm-up
The Free-Fall Laboratory Gizmo™ allows you to measure the motion of
an object in tfree tfall. On the CONTROLS pane check that the
Shuttlecock is selected, the Initial height is 3 meters, and the
Atmosphere is Air.
1. Click Play ( ) to release the shuttlecock. How long does it
taketo fall to the bottom? 0.90 seconds
2. Select the GRAPH tab. The box labeled h (m) should be
checked,displaying a graph of height vs. time. What does this
graph show?
Gizmo Student Exploration: Free-Fall Laboratory,
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(A Grade), Questions and Answers, All Correct
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It starts at 3 and curves down to 0 around 0.75.
3. Turn on the v (m/s) box to see a graph of tvelocity vs. time.
Velocity isthe speed and direction of the object. Velocity is also
referred to as tinstantaneous tvelocity. Because the shuttlecock is
falling downward, its velocity is negative.
Does the velocity stay constant as the object drops? No.
Gizmo Student Exploration: Free-Fall Laboratory,
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