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Science Chapter 12
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Gravity
Terms in this set (21)
Density
The mass of matter per unit of volume.
How is density expressed or described
in units of grams per milliliter, grams per cubic centimeter or kilograms per cubic meter.
Formula for Density is
D = M/V
buoyancy
The measure of the upward force that a fluid exerts on an object that is submerged
Archimedes principle
The buoyant force is equal to the weigh of the fluid displaced by an object..
List three physical properties for a piece of wood
density, volume, mass, color, phase or strength
One cubic centimeter is the same volume as one _________
mililiter
Explain two ways to find the volume of a plastic cube
1. Measure length x width x thickness or 2. Use displacement method by putting cube in the water. The measure how much water was displaced and then take amount of displaced water and subtract that from the total water.
A certain material has a density of .2 grams per milliliter. Is this material better for building a bridge or making cushions for a couch?
This would be better material for a couch because it is not dense enough to be used to build a bridge and this material would be softer.
The density of a gas is lower than the density of a liquid because___________
because atoms in a gas are farther apart than atoms in a liquid
Density is a _____ property of matter.
Physical
Density is the _____ per unit volume of a substance
mass
What measurements must be known in order to find the density of a substance?
mass and volume or the dimensions for calculating the volume of a regular solid
The buoyant force of on an object depends on the ____ of the object that is under water.
Volume
What happens to the buoyant force on an object as it is lowered into the water?
It increases because more water is displaced.
The buoyant force on an object is equal to the weight of the water it ________________.
displaces
When the buoyant force on an object is greater than it's weight, the object__________.
Floats or rises in the fluid.
Solid iron has a density of 7.9 grams per cubic centimeter. Liquid mercury has a density of 13.5 grams per centimeter per cubic centimeter. Will iron float or sink in the mercury
The iron will float in the mercury because it is less dense.
Why is it incorrect to say that heavy objects sink in water.
Heavy is just a physical property. Density determines whether or not an object will float by doing the calculation to determine if the ratio of mass and volume. An object whose density is less than one will float in water no matter what the mass is.
Steel is denser than water and yet steel ships float. Explain?
The ship is not a solid piece of steel. Because of the way the ship is shaped, most of the ship's hull encloses air. The ratio of the total mass of a ship, divided by the total enclosed volume of the ship is less than the density of the water in which it floats. The average density of enclosure we identify as the ship is than the density of the water. There fore the ship floats.
A rock
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