Mass and Weight
What is mass?
Mass is the amount of matter (molecules) in an object.
What is volume?
What is density?
What units are used to measure mass?
Grams (g)
What tool is used to measure mass?
Triple Beam Balance
What is weight?
Weight is a measure of the pull of gravity on an object.
How do you calculate the volume of a regular solid object (like a box)?
Volume is equal to length times width times height (v = l x w x h).
What formula is used to calculate density?
Density equals mass divided by volume.
D = m/v
What units are used to measure volume of liquids?
Milliliters (mL)
What tool is used to measure weight?
Spring Scale (but scales can also be used to measure mass on Earth)
If an object has a mass of 550 grams on Earth, how would its mass compare on the moon?
It would have the same mass of 550 grams on the moon because mass doesn't change due to gravity.
What method is used to determine the volume of an irregular object?
Irregular objects are measured using the DISPLACEMENT METHOD. Also known as Archimedes Principle, you measure the difference in water level in a graduated cylinder with and without the object in. The amount the water level rises is the volume of the object.
What is the density of water?
What units are used to measure volume of solids?
Cubic centimeters (cm3 or cc)
What tool would be used to measure volume of a liquid?
Graduated Cylinder
If an object has a weight of 55 Newtons on the moon, how would its weight compare on Earth?
The object would weigh MORE on Earth because the moon has less gravity than Earth and weight is affected by the pull of gravity.
Does an object with a large volume always have a high density?
No - volume doesn't determine the density. An object with a large volume takes up a lot of space, but it could have a small mass or a very large mass depending on what it is made out of.
What is the density of an object measuring 10 g and 2 cm3?
D = m/v = 10g/2cm3 = 5 g/cm3
What units are used to measure weight?
Newtons (N)
What tool would be used to measure volume of a regular solid object like a rectangular prism?
Ruler
If two objects have the same volume, would the one with more mass or less mass be denser?
If volume is equal, the object with a greater mass would have a higher density since it has more mass in the same amount of space.
If two objects have the same mass, would the one with greater volume or smaller volume have a greater density?
The object with a smaller volume would have a higher density since it would have the same amount of mass in less space.
What would happen to an object with a density of 1.55 g/cm3 if it were dropped into a liquid with a density of 1.50 g/mL?
It would sink since it is more dense than the liquid.
What units are used to measure density?
Grams per cubic centimeter (g/cm3) - Solids
Grams per milliliter (g/mL) - Liquids
What tool would be used to measure the volume of an irregular solid object like a rock?
Graduated Cylinder (small objects) or Overflow Can (large objects)