Flashcards in Test 2 Deck (48):
SI units are based on the
There is one base unit in SI for each property being measured
For each base unit in SI there is a
Example of a standard
Standards are necessary for
An exact quantity that everyone agrees to use for comparison
Amount of stuff in an object
Amount of space an object takes up
The amount of stuff in a certain amount of space
How hard gravity pulls on an object
Density is the:
Measure of the ___________
of different kinds of matter.
How much _______ is in a certain amount of ________.
How dense a substance is depends on:
How much mass the atoms have.
How closely packed the atoms are.
The less dense material will _______ in the denser material.
Does ice or water have the tighter packed atoms?
Water because when it freezes it expands
Each substance has a density that is
Changing the amount of a substance __________ change the density.
Changing the shape of a substance ___________ change the density
If two objects have the same mass the denser one will be_________.
The smaller one
If two objects have the same volume the denser one will be __________.
T or F
A dense object always weighs more than a not dense object
The SI system works in multiples of
___________ units are easier to work with than units based on halves and quarters.
The standard for 1 meter is based on the speed of _________ in a vacuum.
Density can predict floating but not __________ it.
Mass / volume
Getting repetitive measurements that are close to the real value.
A more specific value that is closer to the real value. Another application is getting repetitive answers that are all close together.
(2.15 g is more precise than 2.1 g)
Only goes to the tenths place (22.1 g)
Can be more accurate, but not necessarily.
Can go to the hundredths place (22.17 g)
Because it goes more decimals, it is more precise. It also can be more accurate, depending on the user.
Triple Beam Balance
To read a graduate cylinder properly you need to
Read it at eye level on a flat surface
Read from the bottom of the meniscus (curve)
Graduated cylinder accuracy depends upon:
-material of cylinder
-diameter of cylinder
-person reading the cylinder
When an object is put into a fluid an upward force occurs. __________
This force is called _________
The buoyant force __________ __________ on a completely submerged object because as you go lower there is more pressure on both the top and the bottom of the object.
By knowing that________displaces 1 liter you can determine how many liters of water will be displaced by a certain weight object
To float the weight of water displaced must _______ the weight of the object.
How _____ the object floats in the liquid is determined by the necessary volume of water to equal the weight of the object.
The buoyant force ______ ________ on a completely submerged object because as you go lower there is more pressure on both the top and the bottom of the object. The difference is always the same because the height of the object itself hasn't changed.
The difference in pressure between the bottom of an object and the top of object creates a net _______ _______.
The net upward force opposes gravity and causes objects to seem to weigh ______
being in water doesn't shut off ________
The buoyant force on an object equals the weight of the volume of the fluid displaced (pushed out of the way)
The ________ of the object determines the buoyant force.
How does a steel ship float?
if you formed a steel block into a large, hollowed-out bowl shape and put it in water it would displace a lot of water because of its shape being spread out. It would soon be able to displace enough water to equal the weight of the steel and it would float.