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<h2 class="hd hd-2 unit-title">Topics and Reading List</h2>
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<p> As you go through the lesson, you will find this list of reading from the textbook complementary to the videos and exercises, and on many occasions these readings will contain relevant material to the presentation:</p><ul><li> Newton's Laws of Motion: <a href="/courses/course-v1:MITx+8.01.1x+3T2018/pdfbook/0/chapter/7/2"><i class="it">Chapter 7</i></a></li></ul>
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<h2 class="hd hd-2 unit-title">L4v1: Newton's First and Second Laws</h2>
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<h3 class="hd hd-2">L4v1: Newton's First and Second Laws</h3>
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<h2 class="hd hd-2 unit-title">L4v2: Newton's Third Law</h2>
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<h3 class="hd hd-2">L4v2: Newton's Third Law</h3>
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<h2 class="hd hd-2 unit-title">L4v3: Reference Frames</h2>
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<h2 class="hd hd-2 unit-title">L04Q1: Non-Inertial Frames of References</h2>
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L4Q1-1: Inertial and Non-Inertial Frames of References - Elevator.
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Consider a person standing in an elevator that is accelerating upward with an acceleration of magnitude [mathjaxinline]a[/mathjaxinline]. In the reference frame moving with the elevator, the acceleration of the person is: </p>
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<text> downward and of magnitude equal to g</text>
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<h3 class="hd hd-3 problem-header" id="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train-problem-title" aria-describedby="block-v1:MITx+8.01.1x+3T2018+type@problem+block@lore_ls02_19157_acceleration_of_a_suitcase_on_a_train-problem-progress" tabindex="-1">
L4Q1-2: Acceleration of a Suitcase in a Train
</h3>
<div class="problem-progress" id="block-v1:MITx+8.01.1x+3T2018+type@problem+block@lore_ls02_19157_acceleration_of_a_suitcase_on_a_train-problem-progress"></div>
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<p>
Inside a train car, you push a 5 kg suitcase with 20 N of force in the \(+x\) direction.
No other horizontal forces act on the suitcase. What is the horizontal acceleration of the suitcase in
the following cases?
</p>
<table>
<tr>
<td style="vertical-align:top;width:33.3%;padding-right:1em">
<p><b>Case 1.</b> The train is at rest in the station.</p>
</td>
<td style="vertical-align:top;width:33.3%;padding-right:1em">
<p><b>Case 2.</b> The train begins to pull out of the station, increasing its speed in the \(+x\) direction.</p>
</td>
<td style="vertical-align:top;width:33.3%;padding-right:1em">
<p><b>Case 3.</b> The train now travels in the \(+x\) direction at a constant speed of 3m/s.</p>
</td>
</tr>
<tr>
<td style="vertical-align:top">
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><section id="choicetextinput_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1" class="choicetextinput">
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<section id="forinputlore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_0bc">
<input class="ctinput" type="radio" name="choiceinput_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1" id="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_0bc" value="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_0bc"/>
<span class="mock_label">
The suitcase's horizontal acceleration cannot be determined from the available information.
</span>
<span class="mock_label">
</span>
<p id="answer_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_0bc" class="answer"/>
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<span class="mock_label">
The suitcase's horizontal acceleration has value
</span>
<span class="mock_label">
</span>
<input class="ctinput" type="text" name="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_1_numtolerance_input_0" id="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_1_numtolerance_input_0" value=""/>
<span class="mock_label">
\(\,\text{m/s}^2\)
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<p id="answer_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_2_1_choiceinput_1bc" class="answer"/>
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 2" role="group"><section id="choicetextinput_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_3_1" class="choicetextinput">
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<span class="mock_label">
The suitcase's horizontal acceleration cannot be determined from the available information.
</span>
<span class="mock_label">
</span>
<p id="answer_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_3_1_choiceinput_0bc" class="answer"/>
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<span class="mock_label">
The suitcase's horizontal acceleration has value
</span>
<span class="mock_label">
</span>
<input class="ctinput" type="text" name="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_3_1_choiceinput_1_numtolerance_input_0" id="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_3_1_choiceinput_1_numtolerance_input_0" value=""/>
<span class="mock_label">
\(\,\text{m/s}^2\)
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<p id="answer_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_3_1_choiceinput_1bc" class="answer"/>
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</td>
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 3" role="group"><section id="choicetextinput_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1" class="choicetextinput">
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<span class="mock_label">
The suitcase's horizontal acceleration cannot be determined from the available information.
</span>
<span class="mock_label">
</span>
<p id="answer_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1_choiceinput_0bc" class="answer"/>
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<input class="ctinput" type="radio" name="choiceinput_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1" id="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1_choiceinput_1bc" value="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1_choiceinput_1bc"/>
<span class="mock_label">
The suitcase's horizontal acceleration has value
</span>
<span class="mock_label">
</span>
<input class="ctinput" type="text" name="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1_choiceinput_1_numtolerance_input_0" id="lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1_choiceinput_1_numtolerance_input_0" value=""/>
<span class="mock_label">
\(\,\text{m/s}^2\)
</span>
<p id="answer_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1_choiceinput_1bc" class="answer"/>
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<span class="status unanswered" id="status_lore_ls02_19157_acceleration_of_a_suitcase_on_a_train_4_1" data-tooltip="Not yet answered.">
<span class="sr">unanswered</span><span class="status-icon" aria-hidden="true"/>
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</div>
</section></div>
</td>
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