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Flashcards in Test 2 Deck (48):
1

SI units are based on the

Decimal system

2

There is one base unit in SI for each property being measured

Meter-distance
Liter-volume
Gram-mass

3

For each base unit in SI there is a

Standard

4

Example of a standard

Staples
Power outlet
Bed size
Legos

5

Standards are necessary for

Measurement

6

An exact quantity that everyone agrees to use for comparison

Standard

7

Amount of stuff in an object

Mass

8

Amount of space an object takes up

Volume

9

The amount of stuff in a certain amount of space

Density

10

How hard gravity pulls on an object

Weight

11

1 kilometer

1000 meters

12

1 decimeter

.1 meter

13

5 milliliters

.005 Liters

14

Density is the:
Measure of the ___________
of different kinds of matter.

Compactness

15

Density is:
How much _______ is in a certain amount of ________.

Stuff
Space

16

How dense a substance is depends on:

How much mass the atoms have.
How closely packed the atoms are.

17

The less dense material will _______ in the denser material.

Float

18

Does ice or water have the tighter packed atoms?

Water because when it freezes it expands

19

Each substance has a density that is

Constant

20

Changing the amount of a substance __________ change the density.

Does not

21

Changing the shape of a substance ___________ change the density

Does not

22

If two objects have the same mass the denser one will be_________.

The smaller one

23

If two objects have the same volume the denser one will be __________.

Heavier

24

T or F
A dense object always weighs more than a not dense object

False

25

The SI system works in multiples of

10

26

___________ units are easier to work with than units based on halves and quarters.

Decimal

27

The standard for 1 meter is based on the speed of _________ in a vacuum.

Light

28

Density can predict floating but not __________ it.

explain

29

Density=

Mass / volume

30

Getting repetitive measurements that are close to the real value.

Accuracy

31

A more specific value that is closer to the real value. Another application is getting repetitive answers that are all close together.

Precision
(2.15 g is more precise than 2.1 g)

32

Only goes to the tenths place (22.1 g)
Can be more accurate, but not necessarily.

Electronic Balance

33

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

34

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)

35

Graduated cylinder accuracy depends upon:

-material of cylinder
-diameter of cylinder
-person reading the cylinder

36

When an object is put into a fluid an upward force occurs. __________
This force is called _________

Buoyancy
Buoyant force

37

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.

Doesn't change

38

By knowing that________displaces 1 liter you can determine how many liters of water will be displaced by a certain weight object

2.2 pounds

39

To float the weight of water displaced must _______ the weight of the object.

equal

40

How _____ the object floats in the liquid is determined by the necessary volume of water to equal the weight of the object.

deep

41

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.

doesn't change

42

The difference in pressure between the bottom of an object and the top of object creates a net _______ _______.

upward force

43

The net upward force opposes gravity and causes objects to seem to weigh ______

less

44

being in water doesn't shut off ________

gravity

45

The buoyant force on an object equals the weight of the volume of the fluid displaced (pushed out of the way)

Archimedes Principle

46

The ________ of the object determines the buoyant force.

volume

47

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.

48

Why will a steel block sink?

a steel block is not able to displace enough water for the buoyant force to push on the block and make it float.