Mass & Weight
Define: Mass
Mass = amount of matter in an object.
Volume is the amount of space an object takes up.
Density = ______ ÷ ______
Mass ÷ Volume
Mass is measured in ______ or ______.
Grams (g) or kilograms (kg)
Why do objects float or sink in water?
Because of their density compared to water
What unit is weight measured in?
Newtons (N)
What is the unit for the volume of a regular solid?
cm³
What are the common units for density?
g/mL or g/cm³
Volume is measured in ______, ______, or ______.
Liters (L), milliliters (mL), or cubic centimeters (cm³)
A box has a length of 3 cm, width of 2 cm, and height of 5 cm. What is its volume?
30 cm³
Which never changes—mass or weight?
Mass
What is the formula for the volume of a cube/box?
Length × Width × Height
If an object’s density is less than the liquid it’s in, will it float or sink?
Float
What does “convert” mean?
To change something from one set of units to another
If a rock raises water in a cylinder from 20 mL to 35 mL, what is its volume?
15 mL
(or 15 cm³)
What is the main difference between mass and weight?
Mass = amount of matter; Weight = gravity’s pull on mass
How do you measure the volume of an irregular solid?
Water displacement
If an object’s density is greater than the liquid it’s in, will it float or sink?
Sink
If you have 2 liters of water, how many milliliters is that? (Hint: 1 L = 1,000 mL)
2,000 mL
What tool measures the volume of an irregular object?
Graduated cylinder (water displacement)
On the Moon, would your mass change? Would your weight change?
Mass stays the same; weight decreases.
If water rises from 50 mL to 62 mL when a rock is placed inside, what is the rock’s volume?
12 mL
(or 12 cm³)
A cube has a mass of 24 g and a volume of 8 cm³. What is its density?
3 g/cm³
Convert 10,000 cm³ into liters. (Hint: 1,000 cm³ = 1 L)
10 L
Why do scientists prefer mass over weight when measuring matter?
Because mass never changes