Bài 1: Năng lượng và công
Hướng dẫn giải Vận dụng 1 (Trang 82 SGK Vật lý 10, Bộ Cánh diều)
<p>Bạn h&atilde;y ph&acirc;n t&iacute;ch lực t&aacute;c dụng th&agrave;nh hai th&agrave;nh phần vu&ocirc;ng g&oacute;c với phương dịch chuyển v&agrave;</p> <p>th&agrave;nh phần tr&ugrave;ng với phương dịch chuyển để lập luận r&uacute;t ra biểu thức t&iacute;nh c&ocirc;ng (2).</p> <p><strong>Lời giải:</strong></p> <p><img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/05082022/023b9360-94be-4586-80d7-ce17bfae1149.JPG" /></p> <p>C&ocirc;ng theo phương dịch chuyển:</p> <p><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;msub&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/msub&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/msub&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mi&gt;cos&lt;/mi&gt;&lt;mi&gt;&amp;#x3B1;&lt;/mi&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/math&gt;"><span id="MJXc-Node-1" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-4" class="mjx-mi"></span></span></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi></mi></msub><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>A</mi><mrow><mi>P</mi><mi>x</mi></mrow></msub><mo>=</mo><msub><mi>P</mi><mi>x</mi></msub><mo>.</mo><mi>s</mi><mo>=</mo><mi>P</mi><mo>.</mo><mi>cos</mi><mi>&alpha;</mi><mo>.</mo><mi>s</mi></math><mi></mi></math><math xmlns="http://www.w3.org/1998/Math/MathML"><mi></mi></math></span></p> <p>C&ocirc;ng theo phương vu&ocirc;ng g&oacute;c với phương dịch chuyển:</p> <p><span id="MathJax-Element-2-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;msub&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;/msub&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mi&gt;y&lt;/mi&gt;&lt;/msub&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mi&gt;cos&lt;/mi&gt;&lt;msup&gt;&lt;mn&gt;90&lt;/mn&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msup&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/math&gt;"><span id="MJXc-Node-21" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-22" class="mjx-mrow"><span id="MJXc-Node-23" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-24" class="mjx-mi"></span></span></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi></mi></msub><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>A</mi><mrow><mi>P</mi><mi>y</mi></mrow></msub><mo>=</mo><msub><mi>P</mi><mi>y</mi></msub><mo>.</mo><mi>cos</mi><msup><mn>90</mn><mn>0</mn></msup><mo>.</mo><mi>s</mi><mo>=</mo><mn>0</mn></math><mn></mn></math><math xmlns="http://www.w3.org/1998/Math/MathML"><mn></mn></math></span></p> <p>Tổng c&ocirc;ng dịch chuyển vật:</p> <p><span id="MJXc-Node-43" class="mjx-msub"><span class="mjx-base"><span id="MJXc-Node-44" class="mjx-mi"></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>A</mi><mi>P</mi></msub><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><msub><mi>A</mi><mrow><mi>P</mi><mi>x</mi></mrow></msub><mo>&nbsp;</mo><mo>+</mo><mo>&nbsp;</mo><msub><mi>A</mi><mrow><mi>P</mi><mi>y</mi></mrow></msub><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mi>P</mi><mo>&nbsp;</mo><mo>.</mo><mo>&nbsp;</mo><mi>s</mi><mo>&nbsp;</mo><mo>.</mo><mo>&nbsp;</mo><mi>cos</mi><mo>&nbsp;</mo><mi>&alpha;</mi></math><span id="MJXc-Node-64" class="mjx-mi MJXc-space1"></span></p> <p>&nbsp;</p>
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