TECHNOLOGY-BASED LAB ACTIVITIES

11. Applying results The director wants the crash to occur between 38 m and
42 m from the base of the cliff. Use the following equation to make a recommendation
to the movie director for the initial velocity of the car, v 0 .
v 0 =
∆x
⎯
spred
Calculate both a maximum and a minimum horizontal speed for the car,
and convert your results to units of miles per hour.
12. Evaluating models In what ways is the model of the ball rolling off a ramp
similar to the actual scenario of a car driving off a cliff? In what ways is it
different? How would these differences affect your recommendation to the
director?
EXTENSIONS
1. Making predictions The film editor wants to limit the crash scene, including
footage both of the car traveling toward the cliff and of the fall, to 8.00
seconds. How many seconds of the car traveling towards the edge of the cliff
will the editor be able to include?
2. Graphing The director of photography would like to be able to predict the
path that the car will take as it leaves the cliff. Use the equations from
Chapter 3 of your textbook for horizontal and vertical displacement to
determine the x- and y-coordinates for the car at 0.25 second intervals.
Graph your results. Use your graph to estimate the time the car will take to
hit the beach.
3. Designing experiments Later in the movie, there will be a scene involving
a ski-jump competition. The ramp on the ski jump is tilted upward at the
end so that the skiers leave the ramp at an angle. Design an experiment that
could be used to model a ski jump on a movie set. If you have time and your
teacher approves, carry out the experiment to determine how the angle may
affect the value of s.
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24 HOLT PHYSICS Technology-Based Lab Activities