Lengths
You should have a centimeter ruler. Trace the ruler on a piece of paper, mark the centimeters on the paper (tick marks), and cut out the ruler.
Measure the length of a card (business card, birthday card, or other). Measure the length with both rulers (store and home made).
Take photo of both rulers next to the card so that I can make the same measurements from the photo.
Volume
Put some water into your graduated cylinder and measure the volume.
Take a photo that shows the meniscus clearly*.
Mass
Measure the mass of the store-bought ruler and the mass of your home-made ruler. No photo needed.
Submit the data in an organized manner, the photos can be submitted as additional documents, but include the number of significant figures for each piece of
datum (e.g. {3 sf}).
Procedure for Rounding
Add the lengths from the store ruler and the home-made ruler. Round appropriately, show work, write the quantity (number and unit), make sure the number in
the answer has the correct significant figures. Do this for the rest of these calculations.
Multiply the lengths from the store ruler and the home-made ruler.
What is more precise, the measurements using the store ruler or the hand-made ruler? Explain. "The store ruler is made better than the hand-made one" is not
what I'm looking for. Look at the measurements, they are somewhat different, and this difference allows us to determine which measurement is more precise
without knowing that one was obtained using the store ruler and the other with a hand-made ruler. "One has more significant figures" is also not the correct
answer. 123,456 cm is less precise than 0.1 cm.
What is more precise, the mass of the store ruler or the mass of the hand-made ruler? Explain.