Newton's 3 Laws Lab: Solving Problems on Inclined Plane

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The lab report focuses on analyzing the acceleration of a mass sliding down an inclined plane, with a calculated acceleration of 16.9 m/s² compared to the expected gravitational acceleration of 9.8 m/s². The discrepancy is questioned, with the suggestion that 16.9 m/s² may represent weight rather than true acceleration. For calculating net force on an inclined plane, the application of Newton's 2nd Law (F = ma) is discussed, raising confusion about which acceleration value to use. The conversation emphasizes the need for accurate measurement data and equations to clarify the source of error. Understanding the correct application of Newton's laws is crucial for resolving these issues in the lab report.
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I am doing a lab report for a lab I did in class. The lab is about sliding a mass (in this case a book) down an inclined plane. I collected the data and calculated the acceleration for the mass if it fall at 90 degrees. I have to do an analysis but I having some trouble answering these questions.

1. When I found the acceleration for the mass when it slides down at a 90 degree angle to be 16.9 m/s2. The acceleration of gravity of is 9.8 m/s2. So why isn't this the value of 9.8 m/s2? Is it because 16.9 m/s2 is the weight?

2. How do I find net force on a mass on an inclined plane? I'm pretty sure I have to use Newton's 2nd Law equation: F = ma. But do I use 9.8 m/s2 or 16.9 m/s2 for a?
 
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Clearly the acceleration can't be 16.9m/s^2. Could you please post your measurement data and the equations used to obtain this value? They must contain an error somewhere.
 
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