Unit 7 Progress Check: MCQ Part A
Copyright © 2017. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or
in print beyond your school’s participation i
...
Unit 7 Progress Check: MCQ Part A
Copyright © 2017. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or
in print beyond your school’s participation in the program is prohibited. Page 1 of 25
A group of students must conduct an experiment to determine how the location of an applied force on a
classroom door affects the rotational motion of the door. The rotational inertia of the door about its hinges
is known. The initial angular velocity of the door is zero.
1. Which of the following lists what measuring devices the students need and the measurements they
should take to collect the necessary data to test the relationship between a torque exerted on the
door and the change in angular velocity of that object about the hinges of the door? Justify your
selection.
A
A protractor to measure the angular displacement of the door and a meterstick to measure the
radial distance from the door's hinges to the location where the force is applied.
B
A stopwatch to measure the time interval during which the force is applied and a meterstick to
measure the radial distance from the door's hinges to the location where the force is applied.
C
A force probe to measure the applied force on the door, and a stopwatch to measure the time
interval during which the force is applied, and a meterstick to measure the radial distance from the
door's hinges to the location where the force is applied.
D
A stopwatch to measure the time interval during which the force is applied, a force probe to
measure the applied force on the door, a protractor to measure the angular displacement of the
door, and a meterstick to measure the radial distance from the door's hinges to the location where
the force is applied.
2. The students must determine how to test the relationship between a torque exerted on the door
and the change in the angular velocity of the door. All frictional forces are considered to be
negligible. How should the experiment be conducted to test the relationship between the torque
exerted on the door and the change in the door’s angular velocity in a way that minimizes
experimental uncertainty?
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