Question

1. on earth, mass and weight are the same. if you went to the moon, which would change: mass or weight?
2. using your answer to #1, would the reading be higher or lower on the moon?
3. the volume of objects that have a regular shape can be measured with a ruler.

volume = length × width × height (units are in cm³)
if the object does not have a regular shape, you must use the water displacement method. fill the graduated cylinder to a known level, place the object in the water and record the new level. subtract the beginning water level from the ending water level to determine the volume (units are in ml).
when dealing with density, cm³ and ml are the same. the difference indicates how it was measured.
which method do you think gives the most accurate results? why?

1. given the following densities of objects, determine if they were regular or irregular shaped objects. write an “r” for a regular shaped object or “i” for an irregular shaped object in the blank to the left of the density. save the blank in the parentheses for question #8.

___ 4.7g/cm³ (___)
___ 0.23g/cm³ (___)
___ 2.0g/ml (___)
___ 17.8g/ml (___)
___ 12.6g/cm³ (___)
___ 1.03g/ml (___)

1. if water has a density of 1.0g/ml (or 1.0 g/cm³), would an object less dense than water float or sink?
2. if water has a density of 1.0g/ml (or 1.0 g/cm³), would an object more dense than water float or sink?
3. is the ice in your soda more or less dense than the soda? how do you know?
4. go back to question #4 and in the parentheses behind each density amount, determine if the object will sink or float in water at room temperature. write an “f” if it will float or an “s” if it will sink.
5. if you were to cut any object in half, would the density change? explain why.
6. define density, mass and volume.

density:
mass:
volume:

Explanation:

Question 1

Mass is the amount of matter, constant. Weight depends on gravity. Moon's gravity is less than Earth's, so weight changes, mass doesn't. So weight would change.

From Q1, weight depends on gravity. Moon's gravity is ~1/6 of Earth's. So weight reading (like on a scale) would be lower on Moon.

For regular shapes, ruler (length×width×height) is precise if shape is perfect. For irregular, water displacement is better as it accounts for all volume. Or vice versa: if regular shape is measured accurately, ruler can be precise. But water displacement is better for irregular as ruler can’t measure complex shapes.

Answer:

Weight would change (mass is constant, weight depends on gravity; Moon has less gravity than Earth, so weight changes).

Question 2