density-
DESCRIPTION
DENSITY-. NOTES ON DENSITY. I Density(D). An object’s mass compared to its volume On Earth we can sometimes use weight for mass. IV Density Facts. Things with LOW Density : Soccer Ball Soft Ball Ping Pong Ball. Things with HIGH Density : Bowling Ball Shot put Big Marble. - PowerPoint PPT PresentationTRANSCRIPT
I Density(D)
• An object’s mass compared to its volume
• On Earth we can sometimes use weight for mass.
IV Density Facts
• Things with HIGH Density: Bowling Ball Shot put
• Big Marble
• Things with LOW Density: Soccer Ball Soft Ball
• Ping Pong Ball
I Density(D) Terms
• Mass = how many atoms is in an object (kind of like weight)
• Volume = how much room (space) an object occupies.
• Matter = anything has mass and volume.
I Density(D) Terms
• Mass = grams (or kilograms)
• Volume = milliliters (ml) or cubic centimeters (cc or cm3) , liters (L)
II Density Definition(def)
• Density = how much stuff (matter) is in an object’s volume.
• Density = mass divided by volume
• D = M (mass) D = V M V (volume)
III Measuring Density • MASS-use a balance scale
• Volume-– Calculate volume: (L x W x H)
length x width x height
• Volume- Example: 10 cm x 5 cm x 2 cm =
• 100cm3
III Measuring Density • MASS-use a balance scale
• Volume-– Displacement: put object in a
graduated cylinder and see how much the water level rises.
III more-Measuring Density
• 15 ml add marble 20ml
• What is the difference? This is the volume of the marble.
15 ml20 ml
IV more- Density Facts• Pure water (H2O) has a density
of 1.0 g/cm3
• That means: 1 gram of H2O has a volume of 1 cm3
• 1 cm3 = 1 ml = 1 g of H2O
Why do things float?
•Mass = 42,116,363 Kg
• Volume = 44,070,909 L
•It is bigger than it is heavy
•So it will float
Yikes!
•Mass = 42,999,363 Kg Volume = 44,070,909 L
•Yikes…the mass is increasing due to water inflow
•But the volume is staying the same!
•D =42.9 / 44.0 =.97
Yikes!
•Mass = 43,256,363 Kg Volume = 44,070,909 L
•Yikes…the mass is increasing due to water inflow
•But the volume is staying the same!
•D =43.2 / 44.0 =.98
Yikes!
•Mass = 43,943,363 Kg Volume = 44,070,909 L
•Yikes…the mass is increasing due to water inflow
•But the volume is staying the same!
•D =43.9 / 44.0 =.99
Yikes!
•Mass = 44,060,363 Kg Volume = 44,070,909 L
•Yikes…the mass is increasing due to water inflow
•But the volume is staying the same!
•D =44.0 / 44.0 =1.0
Why do things float?
• Tonnage (gross): 46.328 tonsDisplacement at time of collision: 48,478 tons (figures vary)
• Mass = 42,116,363 Kg• Volume (displacement) = 44,070,909 L• Density = M/V = 42,116,363 Kg / 44,070,909 L = 0.96
Kg/L
Why do things float
• A thing will float if its mass is smaller than its volume.
• A thing will sink if its mass is bigger than its volume