Error analysis/mechanics help appreciated

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To reduce errors in measuring the time for a ping pong ball's drop and bounce, ensure consistent release height and timing methods to account for human reaction time. For measuring voltage across a resistor, use a properly calibrated multimeter and ensure secure connections to minimize contact resistance. When weighing washers, average the mass of multiple measurements to mitigate balance inaccuracies and environmental factors. To measure leg room under the bench, position the ruler accurately and account for parallax error by ensuring eye level is aligned with the measurement. Each technique addresses specific error sources, enhancing the reliability of the measurements.
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State and justify the techniques you would use to reduce the errors of the following. Each explanation should show a clear understanding of why the technique is relevant in the particular situation.

1. Measure the time it takes for a ping pong ball to drop from a height of 50 cm and bounce 3 times.

2. Measure the voltage across a resistor. Imagine you are provided with a connected series circuit of battery in holder, resistor, lamp, contact switch, 2 connecting wires, and a multimeter.

3. Measure the mass of a washer if you are provided with 5 washers and a digital balance.

4. Find the leg room under the bench (distance from the ground to the bottom of the metal strip under the bench top). You are provided with a metre ruler.
 
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Probably the best approach would be for you to tell us where you think which kind of errors would come from and how you would go about dealing with them. Then we'll see how you are thinking about it and can redirect you.
 

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