Solve the Difference in Calculated and Experimental Acceleration

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The discussion revolves around the discrepancy between calculated and experimental acceleration in a physics lab involving a car and weights. Factors contributing to this difference include friction, air resistance, and measurement errors, which can affect experimental results. Newton's laws, particularly the second law of motion, are relevant in understanding these discrepancies. Participants are seeking clarification on how these variables impact the results. Understanding these concepts is crucial for accurately interpreting experimental physics data.
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So we did a lab this week in my physics class.

We had a car on a horizontal table, that was attached to a string with weights (The weights were over the edge of the table.) We then calculated the experimental acceleration and the calculated acceleration. These numbers were different.

My teacher asked us "What was causing the difference between the calculated accel. and experimental acceleration..."
He also mentioned something to do with Newton's laws.

Do you know the answer/Can help me out?
 
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