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Freshman Science > Test 2 > Flashcards

Test 2 Flashcards

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1
Q

SI units are based on the

A

Decimal system

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2
Q

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

A

Meter-distance
Liter-volume
Gram-mass

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3
Q

For each base unit in SI there is a

A

Standard

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4
Q

Example of a standard

A

Staples
Power outlet
Bed size
Legos

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5
Q

Standards are necessary for

A

Measurement

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6
Q

An exact quantity that everyone agrees to use for comparison

A

Standard

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7
Q

Amount of stuff in an object

A

Mass

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8
Q

Amount of space an object takes up

A

Volume

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9
Q

The amount of stuff in a certain amount of space

A

Density

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10
Q

How hard gravity pulls on an object

A

Weight

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11
Q

1 kilometer

A

1000 meters

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12
Q

1 decimeter

A

.1 meter

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13
Q

5 milliliters

A

.005 Liters

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14
Q

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

A

Compactness

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15
Q

Density is:

How much _______ is in a certain amount of ________.

A

Stuff

Space

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16
Q

How dense a substance is depends on:

A

How much mass the atoms have.

How closely packed the atoms are.

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17
Q

The less dense material will _______ in the denser material.

A

Float

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18
Q

Does ice or water have the tighter packed atoms?

A

Water because when it freezes it expands

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19
Q

Each substance has a density that is

A

Constant

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20
Q

Changing the amount of a substance __________ change the density.

A

Does not

21
Q

Changing the shape of a substance ___________ change the density

A

Does not

22
Q

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

A

The smaller one

23
Q

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

A

Heavier

24
Q

T or F

A dense object always weighs more than a not dense object

A

False

25
Q

The SI system works in multiples of

A

10

26
Q

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

A

Decimal

27
Q

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

A

Light

28
Q

Density can predict floating but not __________ it.

A

explain

29
Q

Density=

A

Mass / volume

30
Q

Getting repetitive measurements that are close to the real value.

A

Accuracy

31
Q

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

A

Precision

2.15 g is more precise than 2.1 g

32
Q

Only goes to the tenths place (22.1 g)

Can be more accurate, but not necessarily.

A

Electronic Balance

33
Q

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.

A

Triple Beam Balance

34
Q

To read a graduate cylinder properly you need to

A

Read it at eye level on a flat surface

Read from the bottom of the meniscus (curve)

35
Q

Graduated cylinder accuracy depends upon:

A
  • material of cylinder
  • diameter of cylinder
  • person reading the cylinder
36
Q

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

A

Buoyancy

Buoyant force

37
Q

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.

A

Doesn’t change

38
Q

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

A

2.2 pounds

39
Q

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

A

equal

40
Q

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

A

deep

41
Q

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.

A

doesn’t change

42
Q

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

A

upward force

43
Q

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

A

less

44
Q

being in water doesn’t shut off ________

A

gravity

45
Q

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

A

Archimedes Principle

46
Q

The ________ of the object determines the buoyant force.

A

volume

47
Q

How does a steel ship float?

A

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
Q

Why will a steel block sink?

A

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

Freshman Science (4 decks)

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