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20201122222144lab10 Datatables 1 2

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Physics
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Fullerton College
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Updated 11/16/2020
Phys 221 - Lab 10 Torque
Prof. Chris Persichilli (Adapted from a Lab by Profs. B. Crowell and S. Ji)
Fullerton College
INTRODUCTION:
It is not enough for a boat not to sink. It also must not capsize. This is an example of a general
fact about physics, which is also well known to people who overindulge in alcohol: if an object is to be in
a stable equilibrium at rest, it must not only have zero net force on it, to keep from accelerating, but
also zero net torque, to prevent angular acceleration. In this activity you will examine an object in static
equilibrium and test whether the sum off all forces and all torques is zero.
Figure 1: A meter stick suspended by two spring scales
EQUIPMENT:
A ruler, meter stick, or some other straight, uniform stick
Spring scales, calibrated in newton’s
String
Weight (lead shot, modeling clay, or some-such)
Protractor
Digital scale
Suction cups with a hook
Masking tape
PROCEDURE:

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1. Prepare a 30 cm to 1 m stick (ruler, meter stick, or some such) and measure its mass
2. Tie strings at three different points along your stick
a. None of the strings should be located at the center point of the stick, and there should not
be any reflection symmetry.
b. You can use masking tape to help secure the strings and prevent them from sliding 3. Set up
your experiment. You can use Figure 1 as a guide, but you may have to be creative.
a. You can use suction cups with hooks to hold the spring scales.
b. If you are unable to find a good place to hang your stick, then you can to the
experiment on a flat surface using a third spring scale in place of the weight. If you hang
the stick, do not ignore the weight of the stick in your calculations. If you have it on a
table, be sure the forces of the spring scales are large compared to the friction force.
c. Adjust your setup so that all the spring scales have a force which is within their range
4. Calibrate your spring scales by hanging a mass of known weight and adjusting the calibration tab
so that the scale gives the correct result
5. Determine the magnitude of all the forces acting on the stick
6. Measure the location where all forces are acting on the stick, and the direction of the forces.
a. Before you take this measurement, think about how you will be calculating your
torques. You will need to choose an axis of rotation (which can be any point you like)
and a consistent reference to measure your angles from. Think about what choices will
make your calculation easier.
b. For calculating torque, you should treat the weight of an object as if it is acting at the
object’s center of mass.
7. Repeat this process for a total of two different configurations (change both the location of the
strings on the stick, and the location where the spring scales are anchored).
DATA ANALYSIS:
1. Calculate the torque associated with each of the forces acting on your stick. Since all the forces
are acting in a plane, it is sufficient to use + or for the directions of the torques. 2. Calculate the
total force on the stick. (remember, force is a vector)
3. Calculate the total torque on the stick.
4. Choose one of your configurations and calculate the total torque using a different axis of
rotation.
5. Calculate a percent difference between your total torque calculations which used different axes
of rotation.
No need to perform a formal error analysis for this lab.

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Updated 11/16/2020 Phys 221 - Lab 10 Torque Prof. Chris Persichilli (Adapted from a Lab by Profs. B. Crowell and S. Ji) Fullerton College INTRODUCTION: It is not enough for a boat not to sink. It also must not capsize. This is an example of a general fact about physics, which is also well known to people who overindulge in alcohol: if an object is to be in a stable equilibrium at rest, it must not only have zero net force on it, to keep from accelerating, but also zero net torque, to prevent angular acceleration. In this activity you will examine an object in static equilibrium and test whether the sum off all forces and all torques is zero. Figure 1: A meter stick suspended by two spring scales EQUIPMENT: • • A ruler, meter stick, or some other straight, uniform stick • String • • • • Weight (lead shot, modeling clay, or some-such) • Masking tape Spring scales, calibrated in newton’s Protractor Digital scale Suction cups with a hook PROCEDURE: Updated 11/16/2020 1. Prepare a 30 cm to 1 m stick (ruler, meter stick, or some such) and measure its mass 2. Tie strings at three different points along your stick a. None of the strings should be located at the center point of the stick, and there should not be any reflection symmetry. b. You can use masking tape to help secure the strings and prevent them from sliding 3. Set up your experiment. You can use Figure 1 as a guide, but you may have to be creative. a. You can use suction cups with hoo ...
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