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Science SGO Flashcards

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1
Q

to describe velocity you need to know __________ and ___________

A

speed direction

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2
Q

acceleration is any change in _____________ and _______________

A

speed and direction

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3
Q

Inertia resists ______________ in motion

A

any change

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4
Q

Forces that are equal in size but opposite in direction are ___________ and do not cause a change in motion.

A

balanced

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5
Q

Newton’s first law of motion states that an object remains at rest unless an ___________ force acts on it.

A

unbalanced

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6
Q

Whenever a body is in motion, there is always _________ to oppose the motion.

A

friction

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7
Q

The region of low pressure in a sound wave is called a ____________

A

rarefraction

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8
Q

Doubling the mass of an object will ________ the force.

A

double

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9
Q

As the distance between two objects increases, the gravitational force between the objects ______________.

A

decrease

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10
Q

waves transport ______

A

energy

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11
Q

when light bounces off a surface, it’s called __________

A

reflection

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12
Q

To produce sound, an object must be ____________

A

vibrating

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13
Q

Sound travels fastest in which type of matter?

A

solid

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14
Q

If you pass a building with a siren sounding, as you move away from the building, the sirens will sound ________ in pitch.

A

lower

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15
Q

A light wave is which type of energy?

A

electromagnetic waves

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16
Q

The longest wavelength in the electromagnetic spectrum is the _________

A

radio wave

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17
Q

The material in which a wave travels is a _________

A

medium

18
Q

If an object looks blue, it reflects ________ frequencies of light waves.

A

blue

19
Q

If light waves change speed when they pass from one medium into another, the light will be ___________.

A

refracted

20
Q

Humans are able to only see ______ Light

A

visible

21
Q

Which of the following wavelengths would have the highest frequency?
a. 600m
b. 0.5m ·
c. 450m
d. 330m

A

B. 0.5m

22
Q

Four items are left out in the sunshine for two hours. Which item will experience the least increase in temperature and why? Blue sweatshirt, black chair, white hat

A

White hat

23
Q

Which form of electromagnetic radiation has the highest amount of energy?

A

gamma ray

24
Q

Which of the following is a form of non­mechanical energy?
kinetic
potential
solar

A

solar

25
Q

Potential energy is energy that is ________

A

stored

26
Q

Name some energy resources that are considered renewable

A

Wind, solar power

27
Q

Mechanical energy is the energy associated with ___________ and ______

A

position and motion

28
Q

What is the difference between analog and digital?

A

Digital is more reliable for sending information because it uses a series of 0 and 1, which is not as affected by human error.

29
Q

Name some physical properties of matter.

A

mass volume denisty

30
Q

Which subatomic particle in the atom has a negative charge?

A

electron

31
Q

Which is NOT a sign of a chemical reaction?
Melting
Fire
Unexpected Color change
Precipitate

A

melting

32
Q

The atomic number of an element tells you the number of ________ in an atom

A

protons

33
Q

Two substances are poured into a cup and a reaction occurs. A thermometer is placed in the cup and the temperature in the surrounding area begins to increase. Based on this information, was the reaction endothermic or exothermic?

A

exothermic

34
Q

Write B if the equation is balanced and U if it is unbalanced
S8 + O2 —> 8SO2
16Ag + S8 —> 8Ag2S
H2 + N2 —> 2NH3

A

U
B
U

35
Q

Heat flows from ________ to _________

A

hottest to coolest

36
Q

Why do we use synthetic polymers?
a. Because natural polymers are too expensive
b. Because natural polymers wear out quickly
c. Sometimes natural materials are not available
d. All of the above

A

D

37
Q

Give an example of a natural polymer?

A

cotton, silk

38
Q

____________ are the beginning substances in a chemical equation

A

reactants

39
Q

A reaction in which energy is released is called ______________.

A

exothermic

40
Q

Give an example of a chemical symbol that is a compound

A

H2O

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