Question

Begin your response to QUESTION 2 on this page. 2. (12 points, suggested time 25 minutes) A disk-shaped platform has a known rotational inertia. The platform is mounted on a fixed axle and rotates in a horizontal plane, as shown above. A student wishes to determine the frictional torque exerted on the platform by the axle as the platform rotates. The student has access to equipment that would usually be found in a school physics laboratory. (a) Describe an experimental procedure the student could use to collect the data needed to find the frictional torque exerted on the platform while it rotates. i. What quantities would be measured? ii. What equipment would be used for the measurements, and how would that equipment be used? iii. Describe the overall procedure to be used, including any steps necessary to reduce experimental uncertainty. Give enough detail so that another student could replicate the experiment. (b) Describe how the data from the measurements could be analyzed to determine the frictional torque exerted on the rotating platform.

          Begin your response to QUESTION 2 on this page.
2. (12 points, suggested time 25 minutes)
A disk-shaped platform has a known rotational inertia. The platform is mounted on a fixed axle and rotates in a
horizontal plane, as shown above. A student wishes to determine the frictional torque exerted on the platform by
the axle as the platform rotates. The student has access to equipment that would usually be found in a school
physics laboratory.
(a) Describe an experimental procedure the student could use to collect the data needed to find the frictional
torque exerted on the platform while it rotates.
i. What quantities would be measured?
ii. What equipment would be used for the measurements, and how would that equipment be used?
iii. Describe the overall procedure to be used, including any steps necessary to reduce experimental uncertainty.
Give enough detail so that another student could replicate the experiment.
(b) Describe how the data from the measurements could be analyzed to determine the frictional torque exerted on
the rotating platform.

Begin your response to QUESTION 2 on this page.
2. (12 points, suggested time 25 minutes)
A disk-shaped platform has a known rotational inertia. The platform is mounted on a fixed axle and rotates in a
horizontal plane, as shown above. A student wishes to determine the frictional torque exerted on the platform by
the axle as the platform rotates. The student has access to equipment that would usually be found in a school
physics laboratory.
(a) Describe an experimental procedure the student could use to collect the data needed to find the frictional
torque exerted on the platform while it rotates.
i. What quantities would be measured?
ii. What equipment would be used for the measurements, and how would that equipment be used?
iii. Describe the overall procedure to be used, including any steps necessary to reduce experimental uncertainty.
Give enough detail so that another student could replicate the experiment.
(b) Describe how the data from the measurements could be analyzed to determine the frictional torque exerted on
the rotating platform.

Added by Steven L.

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