Density. Density is a comparison of how much matter there is in a certain amount of space. Which square is more dense?. Density = mass volume solids: d = grams/cubic centimeters (g/cm3) liquids: d = grams/milliliters (g/ml). Calculating Density. ALWAYS REMEMBER THE UNITS!.
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e.g. = 10 cm3
Gravity – downward force of gravity pulling on the object
Buoyant Force – upward force of fluid pushing on the object
Archimedes discovered that:
A ship will float when the weight of the water it displaces equals the weight of the ship.
Anything will float if it is shaped to displace its own weight of water before it reaches the point where it will submerge.
e.g. 7 lbs – 4 lbs = buoyant force of 3 lbs
and the weight of the water displaced by the object is also 3 lbs