Bài 5: Tổng hợp và phân tích lực
Hướng dẫn giải Câu hỏi 1 (Trang 66 SGK Vật lý 10, Bộ Cánh diều)
<p>Biểu diễn quy tắc cộng vectơ cho trường hợp lực F<sub>2</sub>&nbsp;ngược chiều với lực F<sub>1</sub>&nbsp;khi F<sub>1</sub>&nbsp;&gt; F<sub>2</sub>&nbsp;v&agrave; khi F<sub>1</sub>&nbsp;&lt; &nbsp;F<sub>2</sub>.</p> <p><strong>Lời giải:</strong></p> <p>Quy tắc cộng vectơ:&nbsp;<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;mover accent=&quot;true&quot;&gt;&lt;msub&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;mn&gt;12&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;&amp;#x2192;&lt;/mo&gt;&lt;/mover&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mover accent=&quot;true&quot;&gt;&lt;msub&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;&amp;#x2192;&lt;/mo&gt;&lt;/mover&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mover accent=&quot;true&quot;&gt;&lt;msub&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msub&gt;&lt;mo&gt;&amp;#x2192;&lt;/mo&gt;&lt;/mover&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-mover"><span class="mjx-stack"><span class="mjx-over"><span id="MJXc-Node-7" class="mjx-mo"></span></span></span></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><msub><mi>F</mi><mn>12</mn></msub><mo>&#8594;</mo></mover><mo>=</mo><mover><msub><mi>F</mi><mn>1</mn></msub><mo>&#8594;</mo></mover><mo>+</mo><mover><msub><mi>F</mi><mn>2</mn></msub><mo>&#8594;</mo></mover></math><math xmlns="http://www.w3.org/1998/Math/MathML"><mover accent="true"><mo></mo></mover></math></span></p> <p>Lực F<sub>2</sub>&nbsp;ngược chiều với lực F<sub>1</sub>:</p> <p>+ Khi F<sub>1</sub>&nbsp;&gt; F<sub>2</sub>: F<sub>12</sub>&nbsp;= F<sub>1</sub>&nbsp;&ndash; F<sub>2</sub></p> <p><sub><img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/07072022/40c0e0b9-e73a-4408-a61b-ec1a3baa770d.JPG" /></sub></p>
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