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AP PHYSICS 1 UNIT 7 PROGRESS CHECK A/22 QUESTIONS AND ANSWERS(A+)
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AP PHYSICS 1 UNIT 7 PROGRESS CHECK A/22 QUESTIONS AND ANSWERS(A+)
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AP PHYSICS 1 UNIT 7PROGRESS CHECK A/22
QUESTIONS AND
ANSWERS(A+)
A disk is fixed to a horizontal axle that extends
between two supports, as shown in the figure.
Frictional forces between the axle and the supports
is not negligible. At time ts, the disk rotates about
the center axle with an initial angular speed wd. A
student measures the angular displacement Δθ0 of
a point on the edge of the disk from time ts until the
disk no longer rotates. The angular acceleration of
the disk is determined to be αd, and this value
remains constant. Based on the data, if possible,
how could the student predict the angular
displacement of a point on the edge of the disk
from time ts until the disk no longer rotates if the
initial angular speed is increased to 2ωd ? Justify
your selection. - =Use the equation
ω2=ω20+2α(θ−θ0), because the disk comes to
rest, ω0=2ωd, and α=αd. Solve for θ−θ0.
-A disk of radius R=0.5cm rests on a flat, horizontal
surface such that frictional forces are considered to
be negligible. Three forces of unknown magnitude
are exerted on the edge of the disk, as shown in
, the figure. Which of the following lists the essential
measuring devices that, when used together, are
needed to determine the change in angular
momentum of the disk after a known time of 5.0s? -
=force probe and protractor
-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.
The students conduct the experiment and gather
data about the net torque exerted on the door and
angular acceleration of the door for several trials.
They create a graph of the door's angular
acceleration as a function of the net torque and
sketch a best-fit line through the data. How can the
students analyze the data to determine the
rotational inertia of the door about its hinges? -
=Determine the inverse of the slope of the best-fit
line.
-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.
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