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April 20, 2026, 11:49:43 am
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Author Topic: Sample Exam 2006 - Equation of motion.  (Read 826 times)  Share 

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TommyLie

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Sample Exam 2006 - Equation of motion.
« on: November 09, 2012, 09:02:41 pm »
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I'm confused now as two what the term 'equation of motion' means. I always thought it was what my first line (in blue) is, written out with vectors ect. But Itute says it is the acceleration (Second line in red) that is the 'equation of motion'. This doesn't make sense to me. Shouldn't the EoM explain all forces?
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TheRajinator

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Re: Sample Exam 2006 - Equation of motion.
« Reply #1 on: November 09, 2012, 09:24:01 pm »
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Equation of motion refers to putting it into F=ma format, therefore here it should be F=400a=-5000-0.5v^2
That's what I've been taught anywhere...
« Last Edit: November 09, 2012, 09:26:07 pm by TheRajinator »
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TommyLie

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Re: Sample Exam 2006 - Equation of motion.
« Reply #2 on: November 10, 2012, 02:03:39 pm »
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Ok, so if I get a question saying write the 'equation of motion', I should sum up all the forces with the vector notation like I did to start with, then equate the i components to obtain F=ma format? And ignore the vertical forces? Do I then need to rearrange it for 'a' like Itute did?
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d3stiny

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Re: Sample Exam 2006 - Equation of motion.
« Reply #3 on: November 10, 2012, 02:18:25 pm »
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No need for vector notation with straight line motion.

Simply sum up the components that contribute to a net force and let it equal ma. 'Equation of motion' usually doesn't require you to rearrange for 'a', unless it says otherwise.
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